Papers List

 2025

• Bayesian spectroscopy with designed prior probabilities for high-precision estimation of magnetic moments in X-ray magnetic circular dichroism spectra

  Taiga Yamasaki, Kazunori Iwamitsu, Masahiro Sawada, Masahiro Hara, Masaichiro Mizumaki, Bin Liu, Halubai Sekhar and Ichiro Akai

  Science and Technology of Advanced Materials: Methods 5, 2537001 (2025).    

International Conferences

 2024

• Noise-robust analysis of X-Ray absorption near-edge structure based on poisson distribution

  Shuhei Kashiwamura, Shun Katakami, Taiga Yamasaki, Kazunori Iwamitsu, Hiroyuki Kumazoe, Kenji Nagata, Toshihiro Okajima, Ichiro Akai, Masato Okada

  Science and Technology of Advanced Materials: Methods 4, 2397939 (2024).    

• Appropriate basis selection based on Bayesian inference for analyzing measured data reflecting photoelectron wave interference

  Yasuhiko IGARASHI, Fabio IESARI, Hiroyuki SETOYAMA, Toshihiro OKAJIMA, Hiroyuki KUMAZOE, Ichiro AKAI, Masato OKADA,

  J. Phys. Soc. Jp. 93, 074001 (2024).    

• Detection of Nonuniformity in Parameters for Magnetic Domain Pattern Generation by Machine Learning

  Naoya Mamada, Masaichiro Mizumaki, Ichiro Akai, Toru Aonishi,

  J. Phys. Soc. Jp. 93, 054706 (2024).    

International Conferences

 2023

• Comprehensive spectral decomposition analysis of gate modulation spectra measured in a pentacene organic field-effect transistor by Bayesian spectroscopy

  K. Iwamitsu, H. Kumazoe, K. Kanemoto, I. Akai

  J. Appl. Phys, 134, 095501 (2023).    

• Quantifying physical insights cooperatively with exhaustive search for Bayesian spectroscopy of X-ray photoelectron spectra

  Hiroyuki Kumazoe, Kazunori Iwamitsu, Masaki Imamura, Kazutoshi Takahashi, Yoh-ichi Mototake, Masato Okada, Ichiro Akai

  Sci. Rept., 13, 13221 (2023).    

International Conferences

• Bayesian Spectroscopy for X-ray Absorption and X-ray Magnetic Circular Dichroism Spectra Measured on a Nickel Thin Film

  T. Yamasaki, I. Kazunori, H. Kumazoe, M. Sawada, M. Hara, I. Akai

  [A5-P501-29]  MRM2023, Dec. 11-16 (2023), Kyoto International Conference Center, Kyoto, Japan.    

• Gate modulation spectrum analyses in an organic field-effect transistor of pentacene using Bayesian spectroscopy

  K. Iwamitsu, H. Kumazoe, K. Kanemoto, I. Akai

  [A5-O503-05]  MRM2023, Dec. 11-16 (2023), Kyoto International Conference Center, Kyoto, Japan.    

• Mesoscopic spatial variation of electronic states extracted from two-dimensional X-ray absorption spectra representing ion transport in a model electrode of a lithium-ion battery

  I. Akai, K. Iwamitsu, Y. Kimura, K. Amezawa, M. Mizumaki, T. Okajima, T. Aonishi

  [A5-O503-06]  MRM2023, Dec. 11-16 (2023), Kyoto International Conference Center, Kyoto, Japan.    

 2022

• Inverse estimation of parameters for the magnetic domain via dynamics matching using visual-perceptive similarity

  R. Murakami, M. Mizumaki, I. Akai, H. Shouno

  STAM: Method 2, 139-152 (2022).    

• Bayesian Spectral Deconvolution of X-Ray Absorption Near Edge Structure Discriminating High- and Low-Energy Domain

  S. Kashiwamura, S. Katakami, R. Yamagami, K. Iwamitsu, H. Kumazoe, K. Nagata, T. Okajima, I. Akai, M. Okada

  J. Phys. Soc. Jpn. 91, 074009 (2022).    

International Conferences

• Bayesian spectroscopy for synchrotron radiation spectra (invited)

  I. Akai, T. Okajima, M. Mizumaki, T. Aonishi

  ALC'22: 14th Int. Sump. on Atomic Level Characterizations for New Materials and Devices '22, Oct. 16-21 (2022), Bankoku Shiryokan, Okinawa Japan.    

• Bayesian spectroscopy of synthesized X-ray magnetic circular dichroism spectra at the Ni-L3, -L2 edges (invited)

  T. Yamasaki, K. Iwamitsu, H. Kumazoe, M. Okada, M. Mizumaki, I. Akai

  ICMSN-2022: 5th Int. Conf. on Materials Science and Nanotechnology, Oct. 6-7 (2022), London UK, (Hybrid).    

• Data-driven approach for materials research and synchrotron radiation science (invited)

  I. Akai, T. Okajima, M. Mizumaki, T. Aonishi

  IVC-22: The 22nd Int. Vac. Cong., Sep. 11-16 (2022), Sapporo Convention Center, Sapporo Japan.    

 2021

• Bayesian sparse modeling of extended x-ray absorption fine structure to determine interstitial oxygen positions in yttrium oxyhydride epitaxial thin film

  H. Kumazoe, Y. Igarashi, F. Iesari, R. Shimizu, Y. Komatsu, T. Hitosugi, D. Matsumura, H. Saitoh, K. Iwamitsu, T. Okajima, Y. Seno, M. Okada, I. Akai

  AIP Adv. 11, 125013 (2021).    

  Press release: 2021/12/10 Kumamoto Univ. , Tsukuba Univ. , Aichi SR , QST  

• 量子ビーム計測とデータ駆動科学の融合

  赤井一郎

  中性子産業利用推進協議会・季報 「 四季 」 53, 3 (2021).    

• Complex energies of the coherent logitudinal optical phonon-plasmon coupled mode according to dynamic mode decomposition analysis

  I. Sakata, T. Sakata, K. Mizoguchi, S. Tanaka, G. Oohata, I. Akai, Y. Igarashi, Y. Nagano, M. Okada1

  Sci. Rep. 11, 23169 (2021).    

• Non-negative matrix factorization for 2D-XAS images of lithium ion batteries

  H. Tanimoto, X. Hongkun, M. Mizumaki, Y. Seno, J. Uchiwada, R. Yamagami, H. Kumazoe, K. Iwamitsu, Y. Kimura, K. Amezawa, I. Akai

  J. Phys. Commun. 5, 115005 (2021).    

• Replica exchange Monte Carlo method incorporating auto-tuning algorithm based on acceptance ratios for effective Bayesian spectroscopy

  K. Iwamitsu, Y. Nishi, T. Yamasaki, M. Kamezaki, K. Higashiyama, S. Yakura, H. Kumazoe, S. Aihara, K. Nagata, M. Okada, I. Akai

  J. Phys. Soc. Jpn. 90, 104004 (2021).    

• Bayesian Orbital Decomposition and Determination of End Condition for Magnetic Compton Scattering

  Y. Yokoyama, N. Tsuji, I. Akai, K. Nagata, M. Okada, M. Mizumaki

  J. Phys. Soc. Jpn. 90, 094802/1-6 (2021).    

  Press release: 2021/08/30 SPring-8 ,  JST  

• Bayesian spectroscopy of synthesized soft X-ray absorption spectra showing magnetic circular dichroism at the Ni-L₃, -L₂ edges

  T. Yamasaki, K. Iwamitsu, H. Kumazoe, M. Okada, M. Mizumaki, I. Akai

  STAM: Method 1, 75-86 (2021).    

  Press release: 2021/08/30 Kumamoto Univ. ,  JST ,  NIKKEI  

• Performance of Region-Based Markov Random Field with XY spins

  N. Wada, M. Mizumaki, Y. Seno, Y. Kimura, K. Amezawa, M. Okada, I. Akai, T. Aonishi

  J. Phys. Soc. Jpn. 90, 044003 (2021).    

• Obtaining Underlying Parameters from Magnetic Domain Patterns with Machine Learning

  N. Mamada, M. Mizumaki, I. Akai, T. Aonishi

  J. Phys. Soc. Jpn. 90, 014705 (2021).    

• Phase prediction method for pattern formation in time-dependent Ginzburg-Landau dynamics for kinetic Ising model without a priori assumptions of domain patterns

  R. Anzaki, S. Ito, H. Nagao, M. Mizumaki, M. Okada, I. Akai

  Phys. Rev. B 103, 094408 (2021).    

• Texture analysis of magnetic domain images using statistics based on human visual perception

  R. Murakami, M. Mizumaki, Y. Hamano, I. Akai, H. Shouno

  J. Phys. Soc. Jpn. 90, 044705 (2021).    

International Conferences

• A4-O1-04 / Virtual Measurement Analysis by Bayesian Spectroscopy on X-ray Magnetic Circular Dichroism Spectra at the Ni-L₃, -L₂ Edges

  T. Yamasaki, K. Iwamitsu, H. Kumazoe, M. Okada, M. Mizumaki, I. Akai

  MRM2021: Materials Research Meeting 2021, Yokohama Japan, 13-17 Dec. (2021).    

• D4-O3-03 / Investigation of interstitial oxygen positions in an yttrium oxyhydride epitaxial thin film by L₁-regularization analysis of extended X-ray absorption fine structure

  H. Kumazoe, Y. Igarashi, F. Iesari, R. Shimizu, Y. Komatsu, T. Hitosugi, D. Matsumura, H. Saitoh, K. Iwamitsu, T. Okajima, Y. Seno, M. Okada, I. Akai

  MRM2021: Materials Research Meeting 2021, Yokohama Japan, 13-17 Dec. (2021).    

• D4-O3-04 (Symposium Invited) / Detection of Reaction Non-uniformity of Lithium Ion Secondary Batteries by Non-Negative Matrix Factorization

  H. Tanimoto, H. Xu, M. Mizumaki, Y. Seno, J. Uchiwada, R. Yamagami, H. Kumazoe, K. Iwamitsu, Y. Kimura, K. Amezawa, I. Akai, T. Aonishi

  MRM2021: Materials Research Meeting 2021, Yokohama Japan, 13-17 Dec. (2021).    

• D4-O3-05 / Magnetic Domain Texture Pattern Analysis Using Wavelet-Based Joint Texture Statistics

  R. Murakami, M. Mizumaki, I. Akai, H. Shouno

  MRM2021: Materials Research Meeting 2021, Yokohama Japan, 13-17 Dec. (2021).    

• IG06-A004 / Pattern Formation Via the Time-dependent Ginzburg-landau Equation in Spin Systems

  Ryoji ANZAKI, Shin-ichi ITO, Hiromichi NAGAO, Masaichiro MIZUMAKI, Masato OKADA, Ichiro AKAI

  18th Annual Meeting / Asia Oceania Geosciences Society (AOGS2021: Virtual), 01-06 Aug. (2021).    

 2020

• Spectral decomposition of components weaker than noise intensity by Bayesian spectroscopy

  Kazunori Iwamitsu, Masato Okada, Ichiro Akai

  J. Phys. Soc. Jpn. 89, 104004 (2020).    

• Origin of electric field response signals in gate modulation spectroscopy for organic field effect transistors

  K. Kanemoto, A. Iida, K. Iwamitsu, K. Higashiyama, H. Kumazoe, I. Akai

  Organic Electronics 87, 105934 (2020).    

• Spectral Analysis of X-Ray Absorption Near Edge Structure in α-Fe₂O₃ Based on Bayesian Spectroscopy

  Kazunori Iwamitsu, Tatsuhiro Yokota, Koki Murata, Mao Kamezaki, Masaichiro Mizumaki, Tomoya Uruga, Ichiro Akai

  phys. stat. solidi (b) 257, 2000107 (2020).    

• Application of Sparse Modeling to Extended X-ray Absorption Fine Structure Spectra of Transition Metals

  Hiroyuki Setoyama, Ichiro Akai, Kazunori Iwamitsu, Yuuki Miyata, Sho Yakura, Yasuhiko Igarashi, Masato Okada, and Toshihiro Okajima

  J. Phys. Soc. Jpn. 89, 074602 (2020).    

• スパース・モデリングを用いた広域X 線吸収微細構造の解析

  赤井一郎、岩満一功、五十嵐康彦、岡田真人、瀬戸山寛之、岡島敏浩

  日本結晶学会誌 62, 1-8 (2020).
  特集 結晶学と情報学の融合    

• Strained lateral structure and its relaxation in a Cu₂O thin crystal epitaxially grown on MgO surface

  S. Yakura, K. Iwamitsu, S. Hira, T. Yamasaki, Y. Miyata, E. Magome, I. Akai,

  Jpn. J. Appl. Phys. 59, 025506 (2020).    

• Normal mode analysis of a relaxation process with Bayesian inference

  I. Sakata, Y. Nagano, Y. Igarashi, S. Murata, K. Mizoguchi, I. Akai, M. Okada

  Sci. Tech. Adv. Mat. 21, 67 (2020).    

International Conferences

 2019

• Bayesian Spectroscopy with a Replica Exchange Monte Carlo Method for Study of a Biaxial Stress Effect on Excitons in a Cu₂O Thin Crystal

  K. Iwamitsu, M. Okada, I. Akai

  J. Phys. : Conf. ser. 1220, 012009 (2019).    

• Bayesian Hamiltonian Selection in X-ray Photoelectron Spectroscopy

  Y. Mototake, M. Mizumaki, I. Akai, M. Okada

  J. Phys. Soc. Jpn. 88, 034004 (2019).    

International Conferences

• Data-Driven Science for X-Ray Absorption Fine Structure Spectra Measured in Synchrotron Radiation Facilities   (invited)

  Ichiro AKAI, Yoshiki SENO, Masaichiro MIZUMAKI, Toru AONISHI

  MRM2019; Material Research Meeting 2019 / Sumposium B-1: Data-Centric Science for Materials Research / B1-O12-005     2019 Dec. 10-14, Yokohama Sumposia, Japan

• Sparse modeling of extended x-ray absorption fine structures (EXAFS)   (invited)

  Y. IGARASHI, F. IESARI, H. SETOYAMA, T. OKAJIMA, I. AKAI and M. OKADA

  14th International Conference on the Structure of Non-Crystalline Materials / 6I-02     2019 Nov. 3-8, Kobe, Japan

• Bayesian Spectroscopy for X-ray Absorption Near Edge Structures Spectra in Functional Materials

  Kazunori Iwamitsu, Tatsuhiko Yokota, Koki Murata, Mao Kamezaki, Masaichiro Mizumaki, Ichiro Akai

  14th International Conference on the Structure of Non-Crystalline Materials / P32     2019 Nov. 3-8, Kobe, Japan

• L1 regression method to analyze microscopic structure for extended X-ray absorption fine structures

  H. Kumazoe, Y. Igarashi, F. Iesari, K. Iwamitsu, T. Okajima, Y. Seno, M. Okada, I. Akai

  14th International Conference on the Structure of Non-Crystalline Materials / P33     2019 Nov. 3-8, Kobe, Japan

 2018

• Evaporation-rate and substrate-temperature dependence of direct exciton transitions in BiI₃ thin films formed by hot-wall technique on Al₂O₃ substrates

  S. Arishima, K. Murata, R. Sakamoto, T. Ueda, F. Ichikawa, K. Iwamitsu, I. Akai

  physica status solidi (b), 255 1800092/1-9 (2018).     Repository/Kumamoto Univ.

• Bayesian spectroscopy on polarization dependent photoluminescence spectra of doubly-split excitons in a Cu₂O thin-crystal sandwiched by MgO substrates

  A. Kiridoshi, S. Aihara, S. Arishima, T. Yamashiro, M. Mizumaki, K. Iwamitsu, I. Akai

  physica status solidi (b), 1800136/1-9 (2018).     Repository/Kumamoto Univ.

• Bayesian spectroscopy in solid-state photo-physics

  I. Akai, K. Iwamitsu, M. Okada

  J. Phys.: Conf. Ser. 1036, 012022/1-13 (2018).   OPEN ACCESS

• Sparse Modeling of an Extended X-Ray Absorption Fine-Structure Spectrum Based on a Single-Scattering Formalism

  I. Akai, K. Iwamitsu, Y. Igarashi, M. Okada, H. Setoyama, T. Okajima, Y. Hirai

  J. Phys. Soc. Jpn. 87, 074003/1-7 (2018).   OPEN ACCESS
  Press release (2018.6.22)   (PDF in Japanese, 2018.6.22)

• Analysis of Coherent Phonon Signals by Sparsity-promoting Dynamic Mode Decomposition

  S. Murata, S. Aihara, S. Tokuda, K. Iwamitsu, K. Mizoguchi, I. Akai, M. Okada

  J. Phys. Soc. Jpn. 87, 054003/1-5 (2018).   OPEN ACCESS

• Bayesian Spectroscopy of Admixed Photoluminescence Spectra with Exciton, Biexciton and Electron Hole Droplet States in a GaAs/AlAs Type-II Superlattice

  K. Iwamitsu, Y. Furukawa, M. Nakayama, M. Okada, I. Akai

  J. Lumin. 197, 18-22 (2018).   OPEN ACCESS

International Conferences

• Sparse modeling of extended X-ray absorption fine structures   (invited)

  Y. Igarashi, K. Iwamitsu, T. Okajima, I. Akai, M. Okada

  The 3rd International Symposium on Advanced Materials Having Multi-Degrees-of-Freedom - Informatics in Advanced Measurements and Material Science - (ISAMMDoF2018)  

• Bayesian spectroscopy on complicated excitonic photoluminescence spectra in a Cu₂O thincrystal sandwiched by paired MgO substrates

  K. Iwamitsu, S. Arishima, T. Yamashiro, M. Mizumaki, I. Akai

  The 3rd International Symposium on Advanced Materials Having Multi-Degrees-of-Freedom - Informatics in Advanced Measurements and Material Science - (ISAMMDoF2018)  

• Sparse Modeling approach for EXAFS analyses

  Y. Miyata, K. Iwamitsu, H. Setoyama, T. Okajima, Y. Igarashi, M. Okada, I. Akai

  The 3rd International Symposium on Advanced Materials Having Multi-Degrees-of-Freedom - Informatics in Advanced Measurements and Material Science - (ISAMMDoF2018)  

• Gas-phase grown single crystals of 1, 3, 5-triphenylbenzene

  T. Yokota, T. Yamashiro, K. Iwamitsu, I. Akai

  The 3rd International Symposium on Advanced Materials Having Multi-Degrees-of-Freedom - Informatics in Advanced Measurements and Material Science - (ISAMMDoF2018)  

• Bayesian Spectroscopy with a Replica Exchange Monte Carlo Method for Study of a Biaxial Stress Effect on Excitons in a Cu₂2O Thin Crystal

  K. Iwamitsu, M. Okada, I. Akai

  The 12th International Conference on Excitonic and Photonic Processes in Condensed Matter and Nano Materials (EXCON 2018)  

 2017

• High precision modeling of a damped oscillation in coherent phonon signals by Bayesian inference

  S. Aihara, M. Hamamoto, K. Iwamitsu, M. Okada, I. Akai

  AIP Adv. 7, 045107-1-5 (2017).   OPEN ACCESS

International Conferences

• Bayesian Spectroscopy for Spectral and Normal Mode Analyses in Solid-State Materials (invited)

  K. Iwamitsu, M. Okada, and I. Akai

  International Symposium on Kumamoto Synchrotron Radiation (ISKSR5) - The 5th IROAST Seminar - Progress of Data Analysis, Data-Driven Science, and Theory for Science, 2 Nov. 9:35-10:10, 100th Anniversary Memorial Hall, Faculty of Engineering, Kumamoto University, Japan, 1-2 Nov. 2017.  

• Bayesian spectroscopy of excitonic photoluminescence spectra in Cu₂O thin crystals

  A. Kiridoshi, S. Arishima, M. Mizumaki, K. Iwamitsu, I. Akai

  International Symposium on Kumamoto Synchrotron Radiation (ISKSR5) - The 5th IROAST Seminar - Progress of Data Analysis, Data-Driven Science, and Theory for Science, 1 Nov. 16:30-18:00, 100th Anniversary Memorial Hall, Faculty of Engineering, Kumamoto University, Japan, 1-2 Nov. 2017.  

• Bayesian spectroscopy of x-ray photoelectron spectra in graphenes having atomic thicknesses on SiC substrates

  S. Arishima, K. Iwamitsu, K. Takahashi, M. Okada, I. Akai

  International Symposium on Kumamoto Synchrotron Radiation (ISKSR5) - The 5th IROAST Seminar - Progress of Data Analysis, Data-Driven Science, and Theory for Science, 1 Nov. 16:30-18:00, 100th Anniversary Memorial Hall, Faculty of Engineering, Kumamoto University, Japan, 1-2 Nov. 2017.  

• Bayesian spectroscopy in solid-state photo-physics (invited)

  Ichiro Akai, Kazunori Iwamitsu, Masato Okada

  International Meeting on "High-Dimensional Data-Driven Science" (HD³-2017), 13 Sep. 15:20-16:00, Mielparque Kyoto, Japan, 10-13 Sep. 2017.  

• Bayesian spectroscopy for spectral and normal mode analyses in solid-state materials

  Kazunori Iwamitsu, Masato Okada, Ichiro Akai

  International Meeting on "High-Dimensional Data-Driven Science" (HD³-2017), 12 Sep. 14:00-15:40: P-29, Mielparque Kyoto, Japan, 10-13 Sep. 2017.  

• Bayesian spectroscopy of x-ray photoelectron spectra in graphenes having atomic thicknesses on SiC substrates

  S. Arishima, K. Iwamitsu, K. Takahashi, M. Okada, I. Akai

  International Meeting on "High-Dimensional Data-Driven Science" (HD³-2017), 12 Sep. 14:00-15:40: P-28, Mielparque Kyoto, Japan, 10-13 Sep. 2017.  

• Bayesian spectroscopy of excitonic photoluminescence spectra in Cu₂O thin crystals

  A. Kiridoshi, S. Arishima, M. Mizumaki, K. Iwamitsu, and I. Akai

  International Meeting on "High-Dimensional Data-Driven Science" (HD³-2017), 12 Sep. 14:00-15:40: P-33, Mielparque Kyoto, Japan, 10-13 Sep. 2017.  

• Sparse modeling of extended x-ray absorption fine structures (invited)

  Ichiro Akai

  14:40-15:20 in ISKSR4: 4th International Symposium on Kumamoto Synchrotron Radiation: Cooperation of Experiments and Computer Sciences / The 1st IROAST Seminar -, D201, Faculty of Science, Kumamoto University, 15 May. 2017.

 2016

• Bayesian Analysis of an Excitonic Absorption Spectrum in a Cu2O Thin Film Sandwiched by Paired MgO Plates

  K. Iwamitsu, S. Aihara, M. Okada, I. Akai

  J. Phys. Soc. Japan 85, 094716-1-4 (2016).   OPEN ACCESS

• Photoluminescence Spectra of CdTe Multi-Quantum Wells Sandwiched by Ultrathin MnTe Layers and Their Temperature Dependence

  K. Iwamitsu, K. Hatada, S. Ichigozaki, N. Hatada, T. Shimamoto, I. Akai A. Yu. Serov, N. G. Filosofov, G. Karczewski, V. F. Agekian

  J. Lumin. 169, 665-668 (2016).  

International Conferences

• Data Driven Science by Sparse Modeling on Materials Informatics (invited)

  I. Akai

  14:10-14:50 in ISKSR3: 3rd International Symposium on Kumamoto Synchrotron Radiation: Data Analysis and Data-Driven Science, C122, Faculty of Science, Kumamoto University, 30 Nov. 2016..  

• Bayesian analysis of X-ray photoelectron spectra in monolayer and multilayer graphenes grown on SiC(0001)

  K. Iwamitsu, S. Arishima, K. Takahashi, S. Tokuda, M. Okada, and I. Akai

  14:50-15:10 in ISKSR3: 3rd International Symposium on Kumamoto Synchrotron Radiation: Data Analysis and Data-Driven Science, C122, Faculty of Science, Kumamoto University, 30 Nov. 2016..  

• Mode Decomposition of Coherent Phonon Signals by SpDMD

  S. Aihara, S. Murata, S. Tokuda, K. Mizoguchi, M. Okada, I. Akai

  12:10-13:30 in ISKSR3: 3rd International Symposium on Kumamoto Synchrotron Radiation: Data Analysis and Data-Driven Science, C122, Faculty of Science, Kumamoto University, 30 Nov. 2016..  

• Substrate Temperature Dependence of BiI₃ Thin Films on Al₂O₃ Substrate Grown by a Hot-Wall Technique

  R. Sakamoto, K. Iwamitsu, S. Aihara, F. Ichikawa, T. Shimamoto, I. Akai

  12:10-13:30 in ISKSR3: 3rd International Symposium on Kumamoto Synchrotron Radiation: Data Analysis and Data-Driven Science, C122, Faculty of Science, Kumamoto University, 30 Nov. 2016..  

• Photoluminescence spectra in Cu₂O thin crystals recrystallized epitaxially between paired MgO plates and their polarization dependences

  K. Gunji, S. Aihara, A.Kiridoshi, Y. Tsutsumi, K. Iwamitsu, F. Ichikawa, I. Akai

  12:10-13:30 in ISKSR3: 3rd International Symposium on Kumamoto Synchrotron Radiation: Data Analysis and Data-Driven Science, C122, Faculty of Science, Kumamoto University, 30 Nov. 2016..  

• Spectral decomposition of excitonic photoluminescence spectra in Cu₂O thin crystals by Bayesian inference

  A. Kiridoshi, Y. Tsutsumi, K. Gunji, S. Aihara, K. Iwamitsu, S. Tokuda, M. Okada, I. Akai

  12:10-13:30 in ISKSR3: 3rd International Symposium on Kumamoto Synchrotron Radiation: Data Analysis and Data-Driven Science, C122, Faculty of Science, Kumamoto University, 30 Nov. 2016..  

• Spectral decomposition of X-ray photoelectron spectrum in graphenes having atomic thicknesses with a replica exchange Monte Carlo method

  S. Arishima, K. Iwamitsu, S. Aihara, K. Takahashi, S. Tokuda, M. Okada and I. Akai

  12:10-13:30 in ISKSR3: 3rd International Symposium on Kumamoto Synchrotron Radiation: Data Analysis and Data-Driven Science, C122, Faculty of Science, Kumamoto University, 30 Nov. 2016..  

 2015

• Photoluminescence spectra and biaxial stress effects of yellow 1S excitons in Cu₂O thin films recrystallized epitaxially between paired MgO plates

  S. Aihara, A. Ota, K. Iwamitsu, F. Ichikawa, H. Isobe, T. Shimamoto, I. Akai

  J. Lumin. 167 211-215, (2015).  

International Conferences

• Trapping potential formation for the yellow 1S excitons in Cu₂O thin films sandwiched by MgO plates

  S. Aihara K. Gunji, A. Ota, K. Iwamitsu, F. Ichikawa, H. Isobe, T. Shimamoto, I. Akai

  Mo-PM-15, 17th International Conference on Modulated Semiconductor Structures (Joint Conference EP2DS-21/MSS-17), July 26-31, 2015, Sendai, Japan  

• Excitonic Transitions in Thin Films of Layered Semiconductor BiI₃ Grown by a Hot-Wall Technique

  R. Sakamoto, T. Ueda, K. Iwamitsu, F. Ichikawa, K. Watanabe, T. Shimamoto, and I. Akai

  Tu-PM-14, 17th International Conference on Modulated Semiconductor Structures (Joint Conference EP2DS-21/MSS-17), July 26-31, 2015, Sendai, Japan  

• Bayesian Estimation of Excitonic Absorption Spectra

  K. Iwamitsu, S. Aihara, M. Okada, I. Akai

  O-1, International Symposium on Advanced Materials Having Multi-Degrees-of-Freedom -- Optical properties, Structural Analyses, Imaging and Informatics of Materials -- (ISAMMDoF2015), Nov. 2-3, 2015, Kumamoto, Japan  

• Bayesian deconvolution of photoluminescence spectra of yellow 1S excitons in Cu₂O thin films sandwiched by MgO plates

  S. Aihara, K. Gunji, K. Iwamitsu, M. Okada, I. Akai

  O-2, International Symposium on Advanced Materials Having Multi-Degrees-of-Freedom -- Optical properties, Structural Analyses, Imaging and Informatics of Materials -- (ISAMMDoF2015), Nov. 2-3, 2015, Kumamoto, Japan  

• Photoluminescence spectra in Cu₂O thin crystals and thier polarization dependences

  K. Gunji, S. Aihara, F. Ichikawa, I. Akai

  P-11, International Symposium on Advanced Materials Having Multi-Degrees-of-Freedom -- Optical properties, Structural Analyses, Imaging and Informatics of Materials -- (ISAMMDoF2015), Nov. 2-3, 2015, Kumamoto, Japan  

• Optimal Growth Condition of Layered Semiconductor BiI₃ Grown by Hot-Wall Method

  R. Sakamoto, K. Iwamitsu, S. Aihara, F. Ichikawa, T. Shimamoto, I. Akai

  P-12, International Symposium on Advanced Materials Having Multi-Degrees-of-Freedom -- Optical properties, Structural Analyses, Imaging and Informatics of Materials -- (ISAMMDoF2015), Nov. 2-3, 2015, Kumamoto, Japan  

• Long continuing coherent phonon in a bismuth thin-film

  M. Hamamoto, K. Iwamitsu, I. Akai

  P-13, International Symposium on Advanced Materials Having Multi-Degrees-of-Freedom -- Optical properties, Structural Analyses, Imaging and Informatics of Materials -- (ISAMMDoF2015), Nov. 2-3, 2015, Kumamoto, Japan  

• Bayesian estimation of excitonic absorption spectra with the Metropolis algorithm

  K. Iwamitsu, S. Aihara, M. Okada and I. Akai

  , International Meeting on "High-Dimensional Data Driven Science" (HD3-2015) Dec. 14-17, 2015, Kyoto, Japan  

 2014

• Stress Effects on nP Yellow Excitons in Cu₂O Thin Films Recrystallized Epitaxially in a Sample Gap between Paired MgO Substrates

  K. Iwamitsu, S. Aihara, A. Ota, F. Ichikawa, T. Shimamoto, I. Akai

  J. Phys. Soc. Jpn. 83, 124714-1-9 (2014).  

• Thickness dependence of excitonic spectra in Cu₂O thin films sandwiched by MgO plates

  S. Aihara, A. Ota, K. Iwamitsu, T. Shimamoto, and I Akai

  JPS Conf. Proc. 1, 012077-1-5 (2014).  

• Stress-induced effects in yellow and green excitons of Cu₂O thin films sandwiched by MgO plates

  K. Iwamitsu, S. Aihara, A. Ota, Y. Yoshizaki, T. Shimamoto, and I. Akai

  JPS Conf. Proc. 1, 012079-1-5 (2014).  

• Coherent phonons in a 1, 3, 5-tri-phenylbenzene crystal

  T. Kawamoto, Y. Yoshizaki, K. Yamashiro, K. Iwamitsu, T. Shimamoto, and I. Akai

  JPS Conf. Proc. 1, 012071 (2014).  

International Conferences

• Two-Dimensional Compressive Stress Effect in Cu₂O Thin Films Sandwiched by MgO Plates for Accumulating The Yellow Excitons

  K. Iwamitsu, S. Aihara, A. Ota, F. Ichikawa, T. Shimamoto, I. Akai

  D6-O25-007 The 15th IUMRS-International Conference in Asia (IUMRS-ICA 2014)
  Symposium D-6: Novel Functionalities by Cooperative Excitations, 24-30 Aug. 2014 at Fukuoka University, Fukuoka, Japan.  

• Photoluminescence Spectra and Thermodynamics of Trapped Yellow- Excitons in Cu₂O Thin Films under Biaxial Compressive Stresses

  S. Aihara, A. Ota, K. Iwamitsu, F. Ichikawa, T. Shimamoto, I. Akai

  D6-O25-008 The 15th IUMRS-International Conference in Asia (IUMRS-ICA 2014)
  Symposium D-6: Novel Functionalities by Cooperative Excitations, 24-30 Aug. 2014 at Fukuoka University, Fukuoka, Japan.  

• Photoluminescence spectra and their temperature dependence of CdTe multi-quantum wells sandwiched by ultrathin MnTe layers

  K. Iwamitsu, K. Hatada, S. Ichigozaki, N. Hatada, T. Shimamoto, I. Akai, A. Yu. Serov, N. G. Filosofov, G. Karczewski and V. F. Agekyan

  The International Conference of Luminescence (ICL2014)
  13-18 Jul. 2014, Wroclaw, Poland.  

• Photoluminescence spectra and their temperature dependence of yellow-excitons in Cu₂O thin films re-crystalized epitaxially between paired MgO plates

  S. Aihara, A. Ota, K. Iwamitsu, F. Ichikawa, T. Shimamoto, I. Akai

  The International Conference of Luminescence (ICL2014)
  13-18 Jul. 2014, Wroclaw, Poland.  

• Two-Dimensional Compressive Stress Effect in Cu₂O Thin Films Sandwiched by MgO Substrates

  K. Iwamitsu, S. Aihara, A. Ota, F. Ichikawa, T. Shimamoto, and I. Akai

  2nd International Symposium on Kumamoto Synchrotron Radiation (ISKSR2): Young Sciensits’Day 14:50-15:10
  16 May 2014, C226 Lecture Room, Faculty of Science, Kumamoto University

• Photoluminescence spectra and their temperature dependence of yellow-excitons in Cu₂O thin films re-crystallized epitaxially between paired MgO plates

  S. Aihara, A. Ota, K. Iwamitsu, F. Ichikawa, T. Shimamoto, I. Akai

  2nd International Symposium on Kumamoto Synchrotron Radiation (ISKSR2): Young Sciensits’Day 15:10-15:30
  16 May 2014, C226 Lecture Room, Faculty of Science, Kumamoto University

• Diffusion of high density excitons in Lz-gradient quantum well (invited)

  I. Akai

  The Fifth Meeting of Research Consortium on High-pressure Research and The Kumamoto International Symposium on Recent Advancements of Physics and Mineralogy VI 16:00-16:20
  20 Jan. 2014, The 100th Anniversary Hall KUMAMOTO UNIVERSITY

 2013

• Diffusion of high density excitons in Lz-gradient quantum well

  I. Akai, S. Konishi, T. Kitano, T. Kawamoto, K. Iwamitsu, T. Shimamoto and A. Fujii

  Proceedings of 21st Int. Symp. "Nanostructures: Physics and Technology" , 126-127 (2013).   St Petersburg Academic University, 2013, ISBN 978-5-4386-0145-6

• Wavelength modulated excitonic spectra of Cu₂O thin films sandwiched by MgO plates

  K. Iwamitsu, S. Aihara, T. Shimamoto, A. Fujii, and I. Akai

  European Phys. J. B 86, 194-1-6 (2013).  

International Conferences

• Stress-induced effects of Cu2O thin films sandwiched by MgO substrates and their thickness dependence

  K. Iwamitsu, S. Aihara, A. Ota, Y. Yoshizaki, T. Shimamoto and I. Akai

  1st International Symposium on Kumamoto Synchrotron Radiation (ISKSR1): Reverse Monte Carlo modeling for non-crystalline and distorted crystalline materials 15:40-16:00, C329 Lecture Room, Faculty of Science, Kumamoto University Oct. 25 (2013).

• Diffusion of high density excitons in Lz-gradient quantum well

  I. Akai, S. Konishi, T. Kitano, T. Kawamoto, K. Iwamitsu, T. Shimamoto and A. Fujii

  21st Int. Symp. "Nanostructures: Physics and Technology" TN.01o, Saint Petersburg Russia, Jun. 24-28 (2013).  

• Stress-induced effects in yellow and green excitons of Cu₂O thin films sandwiched by MgO plates

  K. Iwamitsua, S. Aihara, A. Ota, Y. Yoshizaki, T. Shimamoto, A. Fujii, I. Akai

  APPC12 / The 12th Asia Pacific Physics Conference A4-PMo16, International Conference Hall, Makuhari Messe, Chiba Japan, Jul. 14-19 (2013).  

• Thickness dependence of excitonic spectra in Cu₂O thin films sandwiched by MgO plates

  S. Aihara, A. Ota, K. Iwamitsu, T. Shimamoto, A. Fujii, I. Akai

  APPC12 / The 12th Asia Pacific Physics Conference A4-4-O1, International Conference Hall, Makuhari Messe, Chiba Japan, Jul. 14-19 (2013).  

• Coherent phonons in 1,3,5-tri-phenylbenzene single crystals

  T. Kawamoto, Y. Yoshizaki, K. Yamashiro, K. Iwamitsu, T. Shimamoto, A. Fujii and I. Akai

  APPC12 / The 12th Asia Pacific Physics Conference A3-PWe-8, International Conference Hall, Makuhari Messe, Chiba Japan, Jul. 14-19 (2013).  

 2012

• Wavelength modulated absorption spectra of Cu₂O thin films sandwiched by MgO plates

  Iwamitsu, Kazunori S. Aihara, A. Ota, Y. Yoshizaki, T. Shimamoto, A. Fujii, I. Akai

  Physics Reports of Kumamoto University 14 41-51, (2012).  

• High Density Excitation Effects in Excitonic Diffusion Processes in L_z-Gradient Quantum Well

  S. Konishi, Y. Nagatomo, K. Iwamitsu, T. Shimamoto, A. Fujii and I. Akai

  phys. status solidi (c) 9 2509-2512, (2012).  

• Wavelength modulated excitonic spectra in green series of Cu₂O thin films sandwiched by MgO plates

  K. Iwamitsu, S. Aihara, T. Shimamoto, A. Fujii and I. Akai

  phys. status solidi (c) 9 2489-2492, (2012).  

• A wavelength modulation system for highly sensitive absorption spectroscopy

  K. Iwamitsu, S. Aihara, T. Shimamoto, A. Fujii, and I. Akai

  Rev. Sci. Instrum. 83 073101, (2012).  

• Unidirectional Exciton Diffusion in Lz-gradient Quantum Well

  I. Akai, S. Inao, Y. Nagatomo, K. Iwamitsu, T.Shimamoto, A. Fujii

  Physics Procedia 29 1, (2012).  

• Dynamics and efficiency of energy transfer in light-harvesting p-conjugated small denderimers

  K. Satake, I. Akai, M. Kimura, I. Katayama, J. Takeda

  Physics Procedia in press, (2012).  

International Conferences

• Excitonic Spectra of Cu₂O Thin Films Sandwiched by MgO Plates

  K. Iwamitsu, S. Aihara, T. Shimamoto, A. Fujii, I. Akai

  International Symposium on Advanced Materials Having Multi-Degrees-of-Freedom (ISAMMDoF) O-2, Kumamoto Japan, Nov. 1-2 (2012).  

• Characteristics of YBa₂Cu₃O_7-x Thin Film Prepared by Shock-Compacted YBa₂Cu₃O_7-x Bulk

  Y. Kim, T. Sueyoshi1, K. Tsuchiya, I. Akai

  International Symposium on Advanced Materials Having Multi-Degrees-of-Freedom (ISAMMDoF) O-3, Kumamoto Japan, Nov. 1-2 (2012).  

• Excitonic Diffusion Processes in Lz-Gradient Quantum Well under High Density Excitation

  S. Konishi, Y. Yoshizaki, K. Iwamitsu, T. Shimamoto, A. Fujii, I. Akai

  International Symposium on Advanced Materials Having Multi-Degrees-of-Freedom (ISAMMDoF) P-11, Kumamoto Japan, Nov. 1-2 (2012).  

• Thickness Dependence of Excitonic Spectra in Cu2O Thin Films Sandwiched by MgO Substrates

  S. Aihara, A. Ota, Y. Yoshizaki, K. Iwamitsu, T. Shimamoto, A. Fujii, I. Akai

  International Symposium on Advanced Materials Having Multi-Degrees-of-Freedom (ISAMMDoF) P-12, Kumamoto Japan, Nov. 1-2 (2012).  

• Coherent Phonons in trans-Stilbene Single Crystals

  Y. Yoshizaki, K. Yamashiro, T. Kawamoto, T. Shimamoto, A. Fujii, I. Akai

  International Symposium on Advanced Materials Having Multi-Degrees-of-Freedom (ISAMMDoF) P-13, Kumamoto Japan, Nov. 1-2 (2012).  

• Optical Spectra of Light-Harvesting Antenna Component Molecules and Their Temperature Dependence

  S. Torihara, Y. Nakamura, K. Iwamitsu, Y. Yoshizaki, A. Fujii, I. Akai

  International Symposium on Advanced Materials Having Multi-Degrees-of-Freedom (ISAMMDoF) P-14, Kumamoto Japan, Nov. 1-2 (2012).  

• Ultrafast Time-Resolved Photoluminescence Spectroscopy by an Optical Kerr Gate Method

  S. Ichigozaki, N. Hatada, T. Iwasaki, Y. Yoshizaki, K. Iwamitsu, A. Fujii, I. Akai

  International Symposium on Advanced Materials Having Multi-Degrees-of-Freedom (ISAMMDoF) P-16, Kumamoto Japan, Nov. 1-2 (2012).  

• Soft-vibrational modes in pi-conjugated antenna subunit molecules of light-harvesting dendrimers

  I. Akai, K. Yamashiro, Y. Yoshizaki, T. Shimamoto, K. Iwamitsu, A. Fujii

  The 10th Int. Conf. on Excitonic Processes in Condensed Matter, Nanostructured and Molecular Materials (EXCON2012) P002, Geoningen The Netherlands, July 2-6 (2012).  

• Wavelength modulated excitonic spectra of Cu2O thin films sandwiched by MgO plates

  K. Iwamitsu, S. Aihara, T. Shimamoto, A. Fujii, and I. Akai

  The 10th Int. Conf. on Excitonic Processes in Condensed Matter, Nanostructured and Molecular Materials (EXCON2012) P044, Geoningen The Netherlands, July 2-6 (2012).  

• Wavelength modulated excitonic spectra in green series of Cu2O thin films sandwiched by MgO plates

  K. Iwamitsu, S. Aihara, T. Shimamoto, A. Fujii, and I. Akai

  5th Int. Conf. on Optical, Optoelectronic & Photonic Materials & Applications (ICOOPMA2012) 1C2-1, Nara Japan, June 3-7 (2012).  

• High Density Excitation Effects in Excitonic Diffusion Processes in Lz-Gradient Quantum Well

  S. Konishi, Y. Nagatomo, K. Iwamitsu, T. Shimamoto, A. Fujii, I. Akai

  5th Int. Conf. on Optical, Optoelectronic & Photonic Materials & Applications (ICOOPMA2012) 1P-23, Nara Japan, June 3-7 (2012).  

 2011

• Spectroscopic investigation of excitons, photocarriers, and　 bias-induced carriers in regioregular poly(3-alkylthiophene)

  K. Kanemoto, M. Yasui, T. Higuchi, D. Kosumi, I. Akai, T. Karasawa, H. Hashimoto

  Phys. Rev. B 83, 205203 (2011).  

• Atomistic mechanisms of rapid energy transport in light-harvesting molecules

  S. Ohmura, S. Koga, I. Akai, F. Shimojo, R. K. Kalia, A. Nakano, P. Vashishta

  Appl. Phys. Lett. 98, 113302 (2011).  

• Rapid energy transfer process through pi*-conjugation network in meta-linked branching dendrimers

  I. Akai, K. Miyanari, T. Shimamoto, A. Fujii, M. Kimura

  phys. status. solidi (c) 8, 155-158 (2011).  

• Vibration analyses and rapid energy transfer in pi-conjugated dendrimers having oligo phenylenevinylene antennas

  T. Shimamoto, K. Miyanari, A. Fujii, I. Akai, M. Kimura

  phys. status. solidi (c) 8, 58-61 (2011).  

International Conferences

• Coherent Phonons in a pi-conjugated Antenna Subunit Molecule of Light-harvesting Dendrimers

  I. Akai, T. Shimamoto, K. Yamashiro, M. Kobori, K. Iwarnitsu, A. Fujii

  The 7th International Dendrimer Symposium (IDS'7 ), I2.1, Washington D.C USA, 26 June-1 July, 2011.

• Nonadiabatic Molecular-Dynamics Study of Electron Transport in Light-harvesting Dendrimers

  S. Ohmura, I. Akai, F. Shimojo, R. K. Kalia , A. Nakano, P. Vashishta

  The 7th International Dendrimer Symposium (IDS'7 ), G1.4, Washington D.C USA, 26 June-1 July, 2011.

• Unidirectional Exciton Diffusion in Lz-gradient Quantum Well

  I. Akai, S. Inao, Y. Nagatomo, K. Iwamitsu, T.Shimamoto, A. Fujii1

  The 16th International Conference on Luminescence (ICL'11 ), TuP204, Michigan USA, 26 June-1 July, 2011.

• Dynamics and efficiency of energy transfer in light-harvesting p-conjugated small denderimers

  K. Satake, I. Akai, M. Kimura, I. Katayama, J. Takeda

  The 16th International Conference on Luminescence (ICL'11 ), WP102, Michigan USA, 26 June-1 July, 2011.

 2010

• Direct optical probing of negative carriers from an operating [6,6]-phenyl C61 butyric acid methyl ester diode

  K. Kanemoto, A. Ogata, N. Inoue, T. Kusumoto, H. Hashimoto, I. Akai, T. Karasawa

  Appl. Phys. Lett. 97, 033307 (2010).  

• Dexter type energy transfer in meta-linked branching dendrimers

  I. Akai, K. Miyanari, T. Shimamoto, A. Fujii, M. Kimura

  Physics Reports of Kumamoto University, 13 , 333-340 (2010).  

• Length dependence of rapid energy transfer in pi-conjugated dendrimers having oligo phenylenevinylene antennas

  T. Shimamoto, K. Miyanari, A. Fujii, I. Akai, M. Kimura

  Physics Reports of Kumamoto University, 13 , 341-348 (2010).  

International Conferences

• Rapid energy transfer process through pi*-conjugattion network in meta-linked branching dendrimers

  I. Akai, K. Miyanari, T. Shimamoto, A. Fujii

  The 9th International Conference on Excitonic and Photonic Processes in Condensed and Nano Materials (EXCON'10 ), 6O01, Brisbane Australia, 11-16 July, 2010.

• Vibration analyses and rapid energy transfer in pi-conjugated dendrimers having oligo phenylenevinylene antennas

  T. Shimamoto, K. Miyanari, A. Fujii, I. Akai

  The 9th International Conference on Excitonic and Photonic Processes in Condensed and Nano Materials (EXCON'10 ), 6P09, Brisbane Australia, 11-16 July, 2010.

• Energy transfer efficiency from light-harvesting antennas to the core in pi-conjugated small dendrimers

  Y. Nagayoshi, K. Satake, I. Akai, M. Kimura, I. Katayama, and J. Takeda

  International Conference on Science and Technology of Synthetic Metals 2010 , 5P-067, Kyoto Japan, 4-9 July, 2010.

• Soft vibrational modes and their importance in LH-dendrimers (invited)

  I. Akai

  The 1st International Symposium on Advanced Soft Materials -- Phyics and Chemistry -- (ISASM), 26 Nov., 16:30-17:00, Kumamoto Japan, 25-26 Nov, 2010.

• First-Principles Simulations of Electron Transport in Light-Harvesting Dendrimers

  S. Ohmura, I. Akai, and F. Shimojo

  The 1st International Symposium on Advanced Soft Materials -- Phyics and Chemistry -- (ISASM), 26 Nov., 16:15-16:00, Kumamoto Japan, 25-26 Nov, 2010.

 2009

• Highly efficient light-harvesting nano- and biomaterials: material design and new laser spectroscopy (invited review)

  J. Takeda, I. Katayama, I. Akai, M. Kimura

  Photosynthesis: Theory and Applications in Energy, Biotechnology and Nanotechnology, Chap. 1, pp.1-42, Nova Science Publisher , (2009).   ,   amazon:

• Temperature effects on quasi-isolated conjugated polymers as revealed by temperature-dependent optical spectra of 16-mer oligothiophene diluted in a sold matrix

  K. Kanemoto,1,I. Akai, M. Sugisaki, H. Hashimoto, T. Karasawa, N. Negishi, Y. Aso

  J. Chem. Phys. 130, 234909 (2009).  

• Morphology-Dependent Carrier and Exciton Generations in Regioregular Poly(3-hexylthiophene) Polymer Diodes as Revealed by Bleaching Spectroscopy

  K. Kanemoto, M. Yasui, D. Kosumi, A. Ogata, M. Sugisaki, T. Karasawa, I. Akai, H.Hashimoto

  Phys. Rev. Lett. 103, 187402 (2009).  

• Intrachain Photoluminescence Dynamics of a Long Oligothiophene at Room Temperature

  K. Kanemoto, M. Sugisaki, H. Hashimoto, I. Akai, T. Karasawa, N. Negishi, Y. Aso

  J. Lumin. 129, 1845-1848 (2009).  

• Decay kinetics of the luminescence of Ag^- centers doped in alkali halide crystals

  T. Kawai, I. Akai, H. Ichida, Y. Kanematsu, K. Mizoguchi, T. Karasawa

  phys. status solidi (b) 246, 1327-1333 (2009).  

• Rapid energy transfer and its temperature dependence in pi-conjugated dendrimers

  I. Akai, K. Miyanari, T. Shimamoto, A. Fujii, H. Nakao, A. Okada, K. Kanemoto, T. Karasawa, A. Ishida, A. Yamada, I. Katayama, J. Takeda, M. Kimura

  phys. status solidi (c) 6, 77-80 (2009).  

• Temperature dependence of intra-chain photoluminescence of a long oligothiophene

  K. Kanemoto, I. Akai, H. Hashimoto, T. Karasawa, N. Negishi, Y. Aso

  phys. status solidi (c) 6, 193-196 (2009).  

International Conferences

• Ultrafast process and temperature dependence of rapid energy transfer in pi-conjugated dendrimers

  I. Akai, K. Miyanari, T. Shimamoto, A. Fujii, K. Kanemoto, J. Takeda, M. Kimura

  International Dendrimer Symposium 2009 (IDS:6), Thu 3.3 , Stockholm Sweden, 14-18 Jun., 2009.

• Vibration analyses and rapid energy transfer process through pi*-conjugation network in phenylene dendrimers

  K. Miyanari, T. Shimamoto, A. Fujii, I. Akai, M. Kimura

  International Dendrimer Symposium 2009 (IDS:6), Poster 3.9 , Stockholm Sweden, 14-18 Jun., 2009.

• Vibration analyses and rapid energy transfer in pi-conjugated dendrimers having oligo phenylenevinylene antennas

  T. Shimamoto, K. Miyanari, A. Fujii, I. Akai, M. Kimura

  International Dendrimer Symposium 2009 (IDS:6), Poster 3.10 , Stockholm Sweden, 14-18 Jun., 2009.

• Ab initio study of light-harvesting antennas of poly(benzyl ether) dendrimers

  S.Koga, F.Shimojo, I.Akai

  International Dendrimer Symposium 2009 (IDS:6), Poster 3.11 , Stockholm Sweden, 14-18 Jun., 2009.

 2008

• Rapid energy transfer in a dendrimer having pi-conjugated light-harvesting antennas   (invited paper)

  I. Akai, K. Miyanari, T. Shimamoto, A. Fujii, H. Nakao, A. Okada, K. Kanemoto, T. Karasawa, H. Hashimoto, A. Ishida, A. Yamada, I. Katayama, J. Takeda, M. Kimura

  New J. Phys., 10 (Special Issue " Molecular electronics ") 125024, (2008).  

• Energy transfer in light-harvesting small dendrimers having pi-conjugated aromatic rings

  I. Akai, T. Shimamoto, A. Fujii, K. Kanemoto, T. Karasawa, H. Hashimoto, I. Katayama, J. Takeda, M. Kimura

  Physics Reports of Kumamoto University, 13, 115-136 (2008).  

• Energy Transfer Dynamics in Wire-Type Dendrimers Having Oligophenylene Peripheries

  I. Akai, M. Higuchi, K. Kanemoto, T. Karasawa, H. Hashimoto, M. Kimura

  J. Lumin. 128, 948-951 (2008).  

• Time-frequency two-dimensional mapping of rapid energy transfer in light-harvesting starshaped dendrimers

  A. Ishida, Y. Makishima, A. Okada, I. Akai, K. Kanemoto, T. Karasawa, M. Kimura, J. Takeda

  J. Lumin. 128, 771-773 (2008).  

International Conferences

• Rapid energy transfer in dendrimers having pi-conjugated light-harvesting antennas

  I. Akai

  The Kumamoto International Symposium on Recent Advancement of Physics and Chemistry of New Materials , Kumamoto Japan, 14 Sep., 2008.

• Rapid energy transfer and its temperature dependence in pi-conjugated dendrimers

  I. Akai, H. Nakao, A. Okada, K. Kanemoto, T. Karasawa, A. Ishida, A. Yamada, I. Katayama, J Takeda, M Kimura

  The 8th International Conference on Excitonic Processes in Condensed Matter, EXCON'08 , Kyoto Japan, 22-27 June, 2008.

• Temperature dependence of intrachain photoluminescence of a long oligothiophene

  K. Kanemoto, I. Akai, H. Hashimoto, T. Karasawaa, N. Negishi, Y. Aso

  The 8th International Conference on Excitonic Processes in Condensed Matter, EXCON'08 , Kyoto Japan, 22-27 June, 2008.

• Energy transfer dynamics in light-harvesting small dendrimers studied by time-frequency two-dimensional imaging spectroscopy

  A. Yamada, A. Ishida, I. Akai, M. Kimura, I. Katayama, J. Takeda

  The 15th International Conference on Luminescence and Optical Spectroscopy of Condensed Matter (ICL'08) , Lyon France, 7-11 July, 2008.

• Intrachain Photoluminescence Dynamics of a Long Oligothiophene at Room Temperature

  K. Kanemoto, M. Sugisaki, H. Hashimoto, I. Akai, T. Karasawa, N. Negishi, Y. Aso

  The 15th International Conference on Luminescence and Optical Spectroscopy of Condensed Matter (ICL'08) , Lyon France, 7-11 July, 2008.

 2007

• Energy transfer dynamics in wire-type dendrimers having oligophenylene antenna

  I. Akai, M. Higuchi, K. Kanemoto, T. Karasawa, H. Hashimoto, M. Kimura

  Cryogenics Report of Kumamoto University 18, 83-87 (2007).

• Temperature dependence of excitonic energy transfer in light-harvesting dendrimers

  I. Akai, T. Kato, A. Okada, K. Kanemoto, T. Karasawa, M. Kimura, M. Ohashi, S. Shinoda, H. Tuskube

  Cryogenics Report of Kumamoto University 18, 93-94 (2007).

• Rapid energy transfer in light-harvesting dendrimers having pi-conjugated antennas

  I. Akai, H. Nakao, A. Okada, K. Kanemoto, T. Karasawa, H. Hashimoto, A. Ishida, Y. Makishima, J. Takeda, M. Kimura

  Cryogenics Report of Kumamoto University 18, 95-125 (2007).

• Intrachain Photoluminescence Dynamics of MEH-PPV in the Solid State

  K. Kanemoto, Y. Imanaka, I. Akai, M. Sugisaki, H. Hashimoto, T. Karasawa

  J. Phys. Chem. B 111, 12389-12394 (2007).  

• Radiative and non-radiative processes of Ag^- centres doped in NaCl single crystals

  T. Kawai, I. Akai, T. Karasawa, S. Hashimoto

  J. Phys.: Condens. Matter 19, 136212 (2007).  

• Exciton and Intracenter Radiative Recombination in ZnMnTe and CdMnTe Quantum Wells with Optically Active Manganese Ions

  V.F.Agekyan, I.Akai, N.N.Vasilev, T.Karasawa, G.Karczewski, A.Yu.Serov, N.G.Filosofov

  Physics of the Solid State 49, 1175-1183 (2007).  

• Mn⁺² and band exciton luminescence in ZnMnTe/ZnMgTe quantum well structures

  V.F. Agekyan, I. Akai, N.G. Filosofov, T. Karasawa, G. Karczewski, A. Yu. Serov, N.N. Vasiliev

  phys. stat. solidi (b) 244, 3265-3270 (2007).  

International Conferences

• Energy Transfer Dynamics in Wire-Type Dendrimers Having Oligophenylene Peripheries

  I. Akai, M. Higuchi, K. Kanemoto, T. Karasawa, H. Hashimoto, M. Kimura

  16th International Conference on Dynamical Processes in Excited States Of Solids, DPC 07 , WeP4-37, Segovia Spain, 17-22 June, 2007.

• Time-frequency two-dimensional mapping of rapid energy transfer in light-harvesting starshaped dendrimers

  A. Ishida, Y. Makishima, A. Okada, I. Akai, K. Kanemoto, T. Karasawa, M. Kimura, J. Takeda

  16th International Conference on Dynamical Processes in Excited States Of Solids, DPC 07 , Tu-P2-06, Segovia Spain, 17-22 June, 2007.

• Temperature dependence of excitonic energy transfer in light-harvesting dendrimers

  I. Akai, T. Kato, A. Okada, K. Kanemoto, T. Karasawa, M. Kimura, M. Ohashi, S. Shinoda, H. Tsukube

  5th International Dendrimer Symposium IDS:5 , , Toulouse France, 28 Agu.- 1 Sep., 2007.

 2006

• Depression of excitonic energy transfer by freezing molecular vibrations in meta-linked branching dendrimers

  I. Akai, T. Kato, A. Okada, K. Kanemoto, T. Karasawa, M. Kimura, M. Ohashi, S. Shinoda, H. Tsukube

  phys. stat. solidi (c) 3, pp.3414-3419 (2006).  

• Morphology dependence of excitonic energy transfer in lightharvesting dendrimers having benzyl ether-type peripheries

  I. Akai, T. Kato, K. Kanemoto, T. Karasawa, M. Ohashi, S. Shinoda, and H. Tsukube

  phys. stat. solidi (c) 3, pp. 3420-3425 (2006).  

• Intrachain photoluminescence properties of conjugated polymers as revealed by long oligothiophenes and polythiophenes diluted in an inactive solid matrix

  K. Kanemoto, T. Sudo, I. Akai, H. Hashimoto, T. Karasawa, Y. Aso, T. Otsubo

  Phys. Rev. B73, pp.235203-1-11 (2006).  

• Quenching of energy transfer by freezing molecular vibrations in light-harvesting small dendrimer

  I. Akai, A. Okada, K. Kanemoto, T. Karasawa, H. Hashimoto, M. Kimura

  J. Lumin., 119-120, pp.283-287 (2006).  

International Conferences

• Depression of excitonic energy transfer by freezing molecular vibrations in meta-linked branching dendrimers

  I. Akai, T. Kato, A. Okada, K. Kanemoto, T. Karasawa, M. Kimura, M. Ohashi, S. Shinoda, H. Tsukube

  The 7th International Conference on Excitonic Processes in Condensed Matter (EXCON'06) 26-30 June 2006, Thu 29, 1-Plenary G-2, Wake Forest University, Winston Salem, North Carolina, USA

• Morphology dependence of excitonic energy transfer in light harvesting dendrimers having benzyl ether-type peripheries

  I. Akai, T. Kato, K. Kanemoto, T. Karasawa, M. Ohashi, S. Shinoda, H. Tsukube

  The 7th International Conference on Excitonic Processes in Condensed Matter (EXCON'06) 26-30 June 2006, Mon 26, 4-Poster, Wake Forest University, Winston Salem, North Carolina, USA

• Exciton and Mn²⁺ intracenter luminescence in ZnMnTe/ZnMgTe heterostructures under high optical excitation

  V. F. Agekyan, I. Akai, N. G. Filosofov, T. Karasawa, G. Karczewski, A. Yu. Serov, N. N. Vassiliev

  14th Int. Symp. "Nanostructures: Physics and Technology" St Petersburg, Russia, June 26-30, 2006

 2005

• Effect of the dilution in polypropylene on photophysical properties of poly(3-alkylthiophenes)

  K. Kanemoto, M. Shishido, T. Sudo, I. Akai, T. Karasawa, Y. Agari

  Synth. Met., 155, pp.162-167 (2005).  

• Rapid energy transfer in light-harvesting small dendrimers

  I. Akai, H. Nakao, K. Kanemoto, T. Karasawa, H. Hashimoto, M. Kimura

  J. Lumin. 112 pp.449-453, (2005).  

• Structure Study and Luminescence Thermochromism in Hexanuclear 6-Methyl-2-Pyridinethiolato Copper(I) Crystals

  H. Xie, I. Kinoshita, T. Karasawa, K. Kimura, T. Nishioka, I. Akai, K. Kanemoto,

  J. Phys. Chem. B 109 pp.9339-9345, (2005).  

• Concentration-dependence of photoluminescence properties in polythiophene diluted in an inactive polymer matrix

  K. Kanemoto, M. Shishido, T. Sudo, I. Akai, H. Hashimoto, T. Karasawa,

  Chem. Phys. Lett. 402 pp.549-553, (2005).  

International Conferences

• Quenching of Energy Transfer by Freezing of Molecular Vibrations in Light Harvesting Nanostar Dendrimer

  I. Akai, A. Okada, K. Kanemoto, T. Karasawa, H. Hashimoto, M. Kimura

  4th International Dendrimer Symposium (IDS-4), 21 May, Track B (Photonics, Electronics 10:30), Mt. Pleasant Michigan, USA, 18-21 May, 2005.

• Quenching of Energy Transfer by Freezing Molecular Vibrations in Light Harvesting Small Dendrimer

  I. Akai, A. Okada, K. Kanemoto, T. Karasawa, H. Hashimoto, M. Kimura

  International Conference on Dynamical Processes in Excited States of Solids 2005 (DPC'05), , Shanghai, China, 1 - 5 Aug. 2005.

 2004

• Photocalorimetric study on nonradiative relaxation processes and photoluminescence quantum yields in Alq₃ single crystals

  I. Akai, K. Harai, K. Kouno, T. Karasawa

  J. Lumin. 108, pp.11-14 (2004).  

• Luminescence processes of hexanuclear methylpyridinethiolato-copper (I) crystals

  H. Xie, M. Tougezaka, S. Oishi, I. Kinoshita, K, Kanemoto, I. Akai, T. Karasawa

  J. Lumin. 108, pp.91-95 (2004).  

• Luminescence of Stepped Quantum Wells in GaAs/GaAlAs and InGaAs/GaAs/GaAlAs Structures

  V. F. Agekyan, Yu. A. Stepanov, I. Akai, T. Karasava, L. E. Vorob'ev, D. A. Firsov, A. E. Zhukov, V. M. Ustinov, A. Zeilmeyer, S. Shmidt, S. Hanna, E. Zibik,

  Semiconductors 38, pp. 565-571, (2004).  

International Conferences

• Exciton Dynamics in CdTe/ZnTe Quantum Dots Grown by Hot-Wall Expitaxy

  I. Akai, K. Watanabe, K. Yamashita, K. Kanemoto, T. Karasawa, H. Hashimoto

  6th International Conference on Excitonic Processes in Condensed Matter, 6-9 July 2004, Cracow, Poland

• Rapid Energy Transfer in Light-Harvesting Small Dendrimers

  I. Akai, H. Nakao, K. Kanemoto, T. Karasawa, H. Hashimoto, M. Kimura

  6th International Conference on Excitonic Processes in Condensed Matter, 6-9 July 2004, Cracow, Poland

 2003

• Morphology and Optical Spectra of Metal Iodate Microcrystals

  V. F. Agekyan, I. Akai, and T. Karasawa

  Physics of the Solid State, 45, pp.1170-1176 (2003).  

• Dynamical Processes of High-Density Excitons in GaSe Crystals

  A. Tanji, H. Xie, I. Akai, T. Karasawa, V. F. Aguekian

  J. Phys. Soc. Jpn. 72, pp.2646-2655 (2003).  

International Conferences

• Photocalorimetric study on nonradiative relaxation processes and photoluminescence quantum yields in Alq₃ single crystals

  I. Akai, K. Harai, K. Kouno, T. Karasawa

  International Conference on Dynamical Processes in Excited States of Solids 2003 (DPC'03), Th10, Christchurch, New Zealand, 3 - 8 Aug. 2003.

• Luminescence processes of hexanuclear methylpyridinethiolato-copper (I) crystals

  H. Xie, M. Tougezaka, S. Oishi, I. Kinoshita, K, Kanemoto, I. Akai, T. Karasawa

  International Conference on Dynamical Processes in Excited States of Solids 2003 (DPC'03), P-30, Christchurch, New Zealand, 3 - 8 Aug. 2003.

• Dynamical energy flows in star-shaped stilbenoid phthalocyanines

  I. Akai, H. Nakao, K. Kanemoto, T. Karasawa, H. Hashimoto, M. Kimura,

  3rd International Dendrimer Symposium (IDS-3), Sep.19 Part II 16.35, Berlin Germany, 17-20 Sep. 2003.

 2002

• Spatial Evolution of Inelastic Scattering of High-Density Excitons in GaSe Crystals

  A. Tanji, I. Akai, T. Karasawa, and V. F. Aguekian

  J Lumin. 94-95 pp. 365-368, (2002).  

• Dynamical processes on high density indirect and direct Excitons in Al_xGa_1-xAs/AlAs quantum wires

  K. Bando, I. Akai, T. Karasawa, K. Maehashi, H. Nakashima

  J Lumin. 94-95 pp. 389-392, (2002).  

• Coherent Motion of High-Density Exciton Masses at a Quasi Two-Dimensional Interface in BiI₃

  Y. Shirasaka, A. Tanji, I. Akai, T. Karasawa

  J Lumin. 94-95 pp. 433-436, (2002).  

• Nonlinear Luminescence of Excitons in HgI₂ Microcrystallites on Porus Polymers

  I. Akai, A. Yamamoto, T. Karasawa, V. F. Aguekian

  Nonlinear Optics 29 pp.345--350 (2002).  

• Anisotropic Diffusion Behavior of Quasi-one Dimensional Excitons in Al_0.2Ga_0.8As/AlAs Quantum Wires

  K. Bando, I. Akai, T. Karasawa, K. Maehashi, H. Nakashima

  Nonlinear Optics 29 pp.197--202 (2002).

• Multiple Exciton Interaction in Condensates of Excitons at a Stacking Fault Interface in BiI₃

  A. Tanji, I. Akai, T. Karasawa

  Nonlinear Optics 29 pp.339--344 (2002).  

• Optical Properties of Hexanuclear 6-Methylpyridinethiolato-Copper (I) Crystals

  H. Xie, M. Tougezaka, I. Kinoshita, K, Kanemoto, I. Akai, T. Karasawa

  Nonlinear Optics 29 pp.647--654 (2002).  

• High-density effects on the exciton systems and their dynamical behavior in Al_xGa_1-xAs/AlAs Quantum Wires

  K. Bando, I. Akai, T. Karasawa, K. Maehashi, H. Nakashima

  Phase Transition 75, pp.1011-1018 (2002).  

• Photo-Induced High-Density Phases of Exciton-Polariton Masses and Their Coherent Propagation at Stacking Fault Interface in BiI₃

  T. Karasawa, A.Tanji, I.Akai

  Phase Transition 75, pp.707--714 (2002).  

International Conferences

• Nonlinear Luminescence of Excitons in HgI₂ Microcrystallites on Porus Polymers

  I. Akai, A. Yamamoto, T. Karasawa, V. F. Aguekian

  5th International Conference Excitonic Processes in Condensed Matter EXCON 2002, XXX, Darwin Australlia, 22 - 26 July 2002

• Anisotropic Diffusion Behavior of Quasi-One Dimensional Excitons in Al_0.2Ga_0.8As/AlAs Quantum Wires

  K. Bando, I. Akai, T. Karasawa, K. Maehashi, H. Nakashima

  5th International Conference Excitonic Processes in Condensed Matter EXCON 2002, XXX, Darwin Australlia, 22 - 26 July 2002

• Multiple Exciton Interaction in Condensates of Excitons at a Stacking Fault Interface in BiI₃

  A.Tanji, I.Akai, and T.Karasawa

  5th International Conference Excitonic Processes in Condensed Matter EXCON 2002, XXX, Darwin Australlia, 22 - 26 July 2002

• Optical Properties of Hexanuclear 6-Methylpyridinethiolato-Copper (I) Crystals

  H. Xie, M. Tougezaka, I. Kinoshita, K, Kanemoto, I. Akai, T. Karasawa

  5th International Conference Excitonic Processes in Condensed Matter EXCON 2002, XXX, Darwin Australlia, 22 - 26 July 2002

 2001

• High Density Excitation Effects on Excitons and Electron-Hole Pairs in Al_xGa_1-xAs/AlAs Quantum Wires

  K. Bando, I. Akai, T. Karasawa, K.Inoue, H. Nakashima

  International Journal of Modern Physics B 15 pp.3757-3761 (2001).  

• Photoluminescence and Dynamics of Excitons in Alq₃ Single Crystals

  Y. Kawasumi, I. Akai, T. Karasawa

  International Journal of Modern Physics B 15 pp.3825-3828 (2001).  

• Spatial Behavior of Exciton-Polariton Masses in a Layered Crystal BiI₃    (invited)

  Y. Shirasaka, H. Mino, T. Kawai, I. Akai, T. Karasawa

  International Journal of Modern Physics B 15 pp.3960-3964 (2001).  

International Conferences

• Spatial Evolution of Inelastic Scattering of High-Density Excitons in GaSe Crystals

  A. Tanji, I. Akai, T. Karasawa, and V. F. Aguekian

  International Conference on Dynamical Processes in Excited States of Solids (DPC'01), July 1-4, 2001, Lyon Frace, P155, (2001)

• Dynamical processes on high density indirect and direct Excitons in Al_xGa_1-xAs/AlAs quantum wires

  K. Bando, I. Akai, T. Karasawa, K. Maehashi, H. Nakashima

  International Conference on Dynamical Processes in Excited States of Solids (DPC'01), July 1-4, 2001, Lyon Frace, P161, (2001)

• Coherent Motion of High-Density Exciton Masses at a Quasi Two-Dimensional Interface in BiI₃

  Y. Shirasaka, A. Tanji, I. Akai, T. Karasawa

  International Conference on Dynamical Processes in Excited States of Solids (DPC'01), July 1-4, 2001, Lyon Frace, P171, (2001)

• High-density effects on the exciton systems and their dynamical behavior in Al_xGa_1-xAs/AlAs Quantum Wires

  K. Bando, I. Akai, T. Karasawa, K. Maehashi, H. Nakashima

  International Conference on "Photoinduced Phase Transitions, their Dynamics and Precursor" (Nov. 14-16. 2001, Tsukuba Japan) P02, (2001)

• Photo-Induced High-Density Phases of Exciton-Polariton Masses and Their Coherent Propagation at Stacking Fault Interface in BiI₃

  T. Karasawa, A.Tanji, I.Akai

  International Conference on "Photoinduced Phase Transitions, their Dynamics and Precursor" (Nov. 14-16. 2001, Tsukuba Japan) O05, (2001)

 2000

• Exciton Transitions of Hexagonal CuI Microcrystallites Grown on Polymers

  A. Tanji, I. Akai, K. Kojima, T. Karasawa, T. Komatsu

  J. Lumin., 87-89, pp. 516-518(2000)  

• Space-Resolved Luminescence and Degenerate Four-Wave-Mixing Spectra of Heavily Photo-Created Exciton States in a Layered Crystal GaSe

  M. Yamamoto, H. Mino, I. Akai, T. Karasawa, V.F. Aguekian

  J. Lumin., 87-89, pp. 275-277(2000)  

• Anormalous Behavior of The High Density Excitons and Their Nonlinear Optical Response in a Quasi Two-Dimensional Space in Layered Crystal BiI₃

  H. Mino, M. Yamamoto, T. Kawai, I. Akai, T. Karasawa

  J. Lumin., 87-89, pp. 278-280(2000)  

• Optical Properties of Al_xGa_1-xAs/AlAs Quantum Wires under High Density Excitation

  K. Bando, I. Akai, T. Karasawa, K.Inoue, H. Nakashima

  Memories of The Institute of Scientific and Industrial Research, Osaka University, Special Issue, 57, pp. 281-282(2000)

International Conferences

• Optical Properties of Al_xGa_1-xAs/AlAs Quantum Wires under High Density Excitation

  K. Bando, I. Akai, T. Karasawa, K.Inoue, H. Nakashima

  The third SANKEN International Symposium "Advanced Nanoelectronics: Devices, Materials, and Computing" March 14-15, 2000, SANKEN Osaka University.

• High Density Excitation Effects on Excitons and Electron-Hole Pairs in Al_xGa_1-xAs/AlAs Quantum Wires

  K. Bando, I. Akai, T. Karasawa, K.Inoue, H. Nakashima

  Yamada Conference LIII 2000 International Conference on Excitonic Processes in Condensed Matter, D-05, p-25 August 22-25, 2000, Osaka City University.

• Photoluminescence and Dynamics of Excitons in Alq₃ Single Crystals

  Y. Kawasumi, I. Akai, T. Karasawa

  Yamada Conference LIII 2000 International Conference on Excitonic Processes in Condensed Matter, D-26, p-46 August 22-25, 2000, Osaka City University.

• Spatial Behavior of Exciton-Polariton Masses in a Layered Crystal BiI₃   (invited)

  Y. Shirasaka, H. Mino, T. Kawai, I. Akai, T. Karasawa

  Yamada Conference LIII 2000 International Conference on Excitonic Processes in Condensed Matter, K-17, p-112 August 22-25, 2000, Osaka City University.

 1999

• A Study of Hight Density Excitons and their Spatial Correlation in a Two-Dimensional Space of a Planar Defect in BiI₃

  H. Mino, T. Kawai, I. AKai, T. Karasawa

  Proceedings of the Third International Conference on Excitonic Processes in Condensed Matter, the Electrochemical Society, Inc., Proceedings 98-25, Editors: R. T. Williams, W. M. Yen, ISBN 1-56677-219-2, pp.304-309, (1999)

International Conferences

• Multi-Exciton Excitation and Ceasing of Lattice Relaxation in Microcrystallites of BiI₃ Embedded in CdI₂ Matrices

  Y. Shirasaka, Y. Ogawa, D. Kim, I. Akai, T. Karasawa, T. Komatsu

  1999 International Conference on Luminescence and Optical Spectroscopy of Condensed Matter ICL'99, (Aug. 23-27, 1999, Osaka IHO / Japan) PA2-19

• Exciton Transitions of Hexagonal CuI Microcrystallites Grown on Polymers

  A. Tanji, I. Akai, K. Kojima, T. Karasawa, T. Komatsu

  1999 International Conference on Luminescence and Optical Spectroscopy of Condensed Matter ICL'99, (Aug. 23-27, 1999, Osaka IHO / Japan) PA3-28

• Space-Resolved Luminescence and Degenerate Four-Wave-Mixing Spectra of Heavily Photo-Created Exciton States in a Layered Crystal GaSe

  M. Yamamoto, H. Mino, I. Akai, T. Karasawa, V.F. Aguekian

  1999 International Conference on Luminescence and Optical Spectroscopy of Condensed Matter ICL'99, (Aug. 23-27, 1999, Osaka IHO / Japan) PB3-2

• Anormalous Behavior of The High Density Excitons and Their Nonlinear Optical Response in a Quasi Two-Dimensional Space in Layered Crystal BiI₃

  H. Mino, M. Yamamoto, T. Kawai, I. Akai, T. Karasawa

  1999 International Conference on Luminescence and Optical Spectroscopy of Condensed Matter ICL'99, (Aug. 23-27, 1999, Osaka IHO / Japan) PB3-3

 1998

• Spatial Propagation of Quasi Two-Dimensional Excitons in a Layered Crystal BiI₃ under the High-Density Excitation

  H. Mino, T. Kawai, I.Akai, T.Karasawa

  J. Lumin., 76 & 77 pp.109-112, (1998)  

International Conferences

• A Study of Hight Density Excitons and their Spatial Correlation in a Two-Dimensional Space of a Planar Defect in BiI₃

  H. Mino, T. Kawai, I. AKai, T. Karasawa

  the Third International Conference on Excitonic Processes in Condensed Matter EXCON'98, (Nov. 1-5, 1998, the Sheraton Boston Hotel / U.S.A.)

 1997

• Coherent and InCoherent Transport Properties of Excitons at High Density at a Quasi Two-Dimensional Space of a Stacking Disorder Interface in a Layered Crystal BiI₃

  T. Karasawa, T. Kawai, I. Akai, and T.Komatsu

  J. Lumin. 72-74 pp.876-878, (1997)  

International Conferences

• Spatial Propagation of Quasi Two-Dimensional Excitons in a Layered Crystal BiI₃ under the High-Density Excitation

  H. Mino, T. Kawai, I.Akai, T.Karasawa

  Proceedings of the 11th International Conference on Dynamical Processes in Excited States of Solids. P012 (1997, Mittelberg, Austria/Germany)

 1996

• Exciton Transitions and Exciton-Phonon Interaction in Nanostructures of Layered Metal Tri-Iodide

  D. Kim, T. Karasawa, I. Akai, T. Komatsu

  Proceedings of the 2nd Int. Conf. on Excitonic Processes in Cond. Matter p.139-142, (1996)

• Exciton Transitions in Growth-Rate Controlled Thin Films and Heterostructures Made of Layered Semiconductors

  I. Akai, D. Kim, T. Karasawa, T. Komatsu

  Proceedings of the 2nd Int. Conf. on Excitonic Processes in Cond. Matter p.131-134, (1996)

• Optical Properties of Nanostructures in Layered Metal Tri-Iodide Crystals

  T. Komatsu, T.Karasawa, I. Akai, T.Iida

  J. Lumin. 70 p.448-467, (1996)  

• Size Effects of Excitons of BiI₃ in Layered Matrices

  T. Komatsu, D. Kim, T. Kobayashi, K. Watanabe, V. F. Aguekian, T. Karasawa, I. Akai, T. Iida

  Surf. Rev. Lett. 3 p.1127-1131, (1996)  

• Space- and Time-Resolved Study of the Nonlinear Optical Responses on the Exciton in a Quasi Two Dimensional System in BiI₃

  T. Karasawa, I. Akai, T. Kawai, H. Kondo, H. Mino, T. Komatsu

  Prog. Cryst. Growth & Characterization Materials 33 p.97-100, (1996)  

• Optical Spectra in The BiI₃/CdI₂:Cryolite Heterostructures

  I. Akai, T. Karasawa, T. Komatsu

  Proceedings of The 2nd Asia Symposium on Condensed Matter Photophysics, p.157-160, (1996)

• Exciton Transitions and Thier Relaxation Processes in Layered Semiconductors GaS

  F. Yasuhara, T. Karasawa, I. Akai, T. Komatsu, V. F. Aguekian

  Proceedings of The 2nd Asia Symposium on Condensed Matter Photophysics, p.161-164, (1996)

• Dynamical and Spatial Behavior of Quasi Two Dimensional Excitons in a Layered Crystal BiI₃ under High Density Exciation

  H. Mino, T. Kawai, I. Akai, T. Karasawa, T. Komatsu

  Proceedings of The 2nd Asia Symposium on Condensed Matter Photophysics, p.169-172, (1996)

• Optical Spectra of Lead Iodide Microcrystals in Porous Glass Matrix

  V. F. Aguekian, A. Serov, T. Komatsu, T. Karasawa, I. Akai

  Proceedings of The 2nd Asia Symposium on Condensed Matter Photophysics, p.173-176, (1996)

• Production of Nanoscale Particles of the Metal Embedded onto the Semiconductor Surface and Their Enhancement of the Photocatalytic Activity

  H. Doi, T. Komatsu, T. Karasawa, I. Akai, T. Kobayashi, Y. Okamoto

  Proceedings of The 2nd Asia Symposium on Condensed Matter Photophysics, p.177-180, (1996)

International Conferences

• Exciton Transitions and Exciton-Phonon Interaction in Nanostructures of Layered Metal Tri-Iodide

  D. Kim, T. Karasawa, I. Akai, T. Komatsu

  EXCON'96,the 2nd Int. Conf. on Excitonic Processes in Cond. Matter, Gohrischer Hof, Germany, Aug.14-17 (1996)

• Exciton Transitions in Growth-Rate Controlled Thin Films and Heterostructures Made of Layered Semiconductors

  I. Akai, D. Kim, T. Karasawa, T. Komatsu

  EXCON'96,the 2nd Int. Conf. on Excitonic Processes in Cond. Matter, Gohrischer Hof, Germany, Aug.14-17 (1996)

• Coherent and Incoherent Transport Properties of Excitons at High Density at a Quasi Two Dimensional Space of a Stacking Disorder Interface

  T. Karasawa, T. Kawai, H. Mino, I. Akai, T. Komatsu

  ICL'96, Int. Conf. on Lumin. and Opt. Spectroscopy of Condensed Matter, Prague, Czech Republic, Aug.18-23 (1996)

• Optical Spectra in The BiI₃/CdI₂:Cryolite Heterostructures

  I. Akai, T. Karasawa, T. Komatsu

  The 2nd Asia Symposium on Condensed Matter Photophysics, Nara Japan, Nov.1-2, (1996)

• Exciton Transitions and Thier Relaxation Processes in Layered Semiconductors GaS

  F. Yasuhara, T. Karasawa, I. Akai, T. Komatsu, V. F. Aguekian

  The 2nd Asia Symposium on Condensed Matter Photophysics, Nara Japan, Nov.1-2, (1996)

• Dynamical and Spatial Behavior of Quasi Two Dimensional Excitons in a Layered Crystal BiI₃ under High Density Exciation

  H. Mino, T. Kawai, I. Akai, T. Karasawa, T. Komatsu

  The 2nd Asia Symposium on Condensed Matter Photophysics, Nara Japan, Nov.1-2, (1996)

• Optical Spectra of Lead Iodide Microcrystals in Porous Glass Matrix

  V. F. Aguekian, A. Serov, T. Komatsu, T. Karasawa, I. Akai

  The 2nd Asia Symposium on Condensed Matter Photophysics, Nara Japan, Nov.1-2, (1996)

• Production of Nanoscale Particles of the Metal Embedded onto the Semiconductor Surface and Their Enhancement of the Photocatalytic Activity

  H. Doi, T. Komatsu, T. Karasawa, I. Akai, T. Kobayashi, Y. Okamoto

  The 2nd Asia Symposium on Condensed Matter Photophysics, Nara Japan, Nov.1-2, (1996)

 1995

• Polarization Characteristics of Excitons Localized at Stacking Fault in BiI₃ Layered Crystals

  T.Komatsu, T.Iida, I.Akai, T.Aikami, V.F.Agekyan

  Phys. Solid State 37 p.1332-1337 (1995)

• Dynamical Process of Excitons under Magnetic Fields in GaAs/(AlGa)As Superlattice

  T.Komatsu, E.Kawahata, T.Karasawa, I.Akai, V.F.Aguekian, M.Nakayama, K.Uchida, N.Miura

  J. Lumin., 66&67 p.468-472, (1995)  

• Lateral Transport and Dynamical Behavior of Quasi Two-Dimensional Excitons at High Density along a Stacking Disorder Plane in Layered BiI₃

  H.Kondo, T.Kawai, T.Karasawa, I.Akai, T.Komatsu

  J. Lumin., 66&67 p.448-452, (1995)  

• Dynamical Properties of Confined Excitons in BiI₃ Microcrystallites and Ultra-Thin Films Embedded in CdI₂ Matrices

  D.Kim, T.Karasawa, I.Akai, T.Komatsu, T.Kobayashi

  J. Lumin., 66&67 p.443-447, (1995)  

• Nonlinear Optical Spectra of the Confined Excitons in Stress Induced Nanostructures in BiI₃

  I.Akai, T.Karasawa, T.Komatsu, S.Iwai, K.Edamatsu, T.Itoh, S.Yano, T.Goto

  Jpn J. Appl. Phys. 34 Suppl.34-1 (1995) 113-115  

• Raman Scattering and Electronic Structures under Hydrostatic Pressures in Layered MI₃ (M=Bi, Sb, As) Crystals

  A.Sitoh, E.Kawahata, T.Komatsu, I.Akai, T.Karasawa, H.Kurisu, H.Ohtake, T.Suemoto

  Proceeding of the Asia Symposium on Solid State Photophysics, Nara 1995, (1995) 189-192

• Dynamical and Spatial Behavior of Quasi Two-Dimensional Excitons in a Layered Crystal BiI₃ under High Density Excitation

  T.Kawai, H.Kondo, I.Akai, T.Karasawa, T.Komatsu

  Proceeding of the Asia Symposium on Solid State Photophysics, Nara 1995, (1995) 225-228

• Dynamical Process of Free Exciton Magnetic Polarons in Diluted Magnetic Semiconductor CdMnTe Observed by a Weak excitation Time-Resolved Photoluminescence

  S.Takeyama, S.Adachi, Y.Takagi, T.Karasawa, I.Akai, T.Komatsu, V.F.Aguekian

  Proc. of The Workshop on Highlights of Light Spectroscopy on Semiconductors, p.289-291 (1995)

International Conferences

• Dynamical Process of Free Exciton Magnetic Polarons in Diluted Magnetic Semiconductor CdMnTe Observed by a Weak excitation Time-Resolved Photoluminescence

  S.Takeyama, S.Adachi, Y.Takagi, T.Karasawa, I.Akai, T.Komatsu, V.F.Aguekian

  The Workshop on Highlights of Light Spectroscopy on Semiconductors, 1995 Frascati

• Raman Scattering and Electronic Structures under Hydrostatic Pressures in Layered MI₃ (M=Bi, Sb, As) Crystals

  A.Sitoh, E.Kawahata, T.Komatsu, I.Akai, T.Karasawa, H.Kurisu, H.Ohtake, T.Suemoto

  The Asia Symposium on Solid State Photophysics, Nara 1995

• Dynamical and Spatial Behavior of Quasi Two-Dimensional Excitons in a Layered Crystal BiI₃ under High Density Excitation

  T.Kawai, H.Kondo, I.Akai, T.Karasawa, T.Komatsu

  The Asia Symposium on Solid State Photophysics, Nara 1995

 1994

• High Density Exciton Behavior and Bi-Exciton States on the Stacking Fault Exciton in BiI₃

  H.Kondo, T.Karasawa, I.Akai, M.Ichida, T.Komatsu

  J. Lumin. 60&61 p.658-660, (1994)  

• Pressure Effects on Excitons, Phonons and Exciton-Phonon Interactions in BiI₃ and SbI₃ Single Crystals

  H.Kurisu, T.Komatsu, T.Tanaka, I.Akai, T.Karasawa, T.Iida

  J. Lumin. 60&61 p.816-818, (1994)  

International Conferences

• Exciton Spectra in Disk-like Small Particles of BiI₃ Embedded in Layered Crystals

  T.Komatsu, D.Kim, T.Kobayashi, T.Karasawa, I.Akai, T.Iida

  7th International Symposium on Small Particles and Inorganic Clusters, (Kobe), (1994)

 1993

• Nonlinear Optical Spectra of Confined and Localized Excitons in Mesoscopic Domain and Quasi-2D Stacking Fault Interface in BiI₃

  I.Akai, H.Kondo, M.Ichida, T.Karasawa, T.Komatsu

  J. de Physique IV Colloque C5, supplement au Journal de Physique II 3 p.433-436 (1993)  

• Exciton Luminescence in Tin Dioxide Single Crystals

  V.F.Aguekian, Y.A.Stepanov, I.Akai, T.Karasawa, T.Komatsu

  J. Phys. Soc. Jpn 62 p.4516-4521 (1993)  

International Conferences

• Nonlinear Optical Spectra of Confined and Localized Excitons in Mesoscopic Domain and Quasi-2D Stacking Fault Interface in BiI₃

  I.Akai, H.Kondo, M.Ichida, T.Karasawa, T.Komatsu

  3rd International Conference on Optics of Excitons in Confined Systems, 1993 Montpellier France

• High Density Exciton Behavior and Bi-Exciton States on the Stacking Fault Exciton in BiI₃

  H.Kondo, T.Karasawa, I.Akai, M.Ichida, T.Komatsu

  The International Conference on Luminescence '93, 1993 Connecticut USA

• Pressure Effects on Excitons, Phonons and Exciton-Phonon Interactions in BiI₃ and SbI₃ Single Crystals

  H.Kurisu, T.Komatsu, T.Tanaka, I.Akai, T.Karasawa, T.Iida

  The International Conference on Luminescence '93, 1993 Connecticut USA

 1992

• Optical Stark Effects on the Stacking Fault Excitons in BiI₃   (invited paper)

  I.Akai, T.Karasawa, T.Komatsu

  International J. of Nonlinear Opt. Phys. Mater.1 p.311-337 (1992)  

• Picosecond Time Resolved Spectra of the Optical Stark Effects on the Stacking Fault Excitons in BiI₃ Crystals

  I.Akai, K.Nakajima, T.Karasawa, M.Ichida, T.Komatsu

  Mol. Cryst. Liq. Cryst. 218 p.25-30 (1992)  

• Excitons Localized in Mesoscopic Domains Produced by Stacking Fault in BiI₃

  T.Komatsu, T.Iida, K.Murayama, M.Ichida, H.Kurisu, H.Kondo, I.Akai, T.Karasawa

  Mol. Cryst. Liq. Cryst. 218 p.37-42 (1992)  

• Optical Nonlinear Effects of the Stacking Fault Excitons in BiI₃

  I.Akai, K.Nakajima, M.Ichida, T.Karasawa, T.Komatsu

  Proceeding of the 2nd Taiwan-Japan Workshop on Solid State Optical Spectroscopy 1992 Osaka, p.176-179 (1992)

International Conferences

• Optical Nonlinear Effects of the Stacking Fault Excitons in BiI₃

  I.Akai, K.Nakajima, M.Ichida, T.Karasawa, T.Komatsu

  The 2nd Taiwan-Japan Workshop on Solid State Optical Spectroscopy, 1992 Osaka Japan

 1991

• Optical Stark Effects in the Multiple Exciton States at a Stacking-Fault Plane in BiI₃ Crystals

  I.Akai, T.Karasawa, T.Komatsu, Y.Kaifu

  Phys. Rev. B43 p.4484-4487 (1991)

• Nonlinear Optical Properties of BiI₃ Crystals

  T.Karasawa, I.Akai, T.Komatsu

  Nonlinear Optics 1 p.51-59 (1991)

• Observation of Propagation of Exciton-Polaritons along Stacking Fault Plane in Layered Crystal BiI₃

  T.Kawai, S.Shimanuki, T.Karasawa, I.Akai, T.Iida, T.Komatsu

  J. Lumin. 48-49 Part.2 pp. IN9-IN10 (1991)

• Ultrafast Nonlinear Optical Response and High Density Excitation Effects of the Stacking Fault Exciton in BiI₃

  T.Karasawa, M.Ichida, I.Akai, T.Komatsu

  Appl. Phys. A53 p.480-490 (1991)

International Conferences

• Picosecond Time Resolved Spectra of the Optical Stark Effects on the Stacking Fault Excitons in BiI₃ Crystals

  I.Akai, K.Nakajima, T.Karasawa, M.Ichida, T.Komatsu

  5th International Symposium on Unconventional Photoactive Solids. Molecular Systems, 1991 Okazaki Japan

• Excitons Localized in Mesoscopic Domains Produced by Stacking Fault in BiI₃

  T.Komatsu, T.Iida, K.Murayama, M.Ichida, H.Kurisu, H.Kondo, I.Akai, T.Karasawa

  5th International Symposium on Unconventional Photoactive Solids. Molecular Systems, 1991 Okazaki Japan

 1990

• Temporal Behavior of the Optical Stark Effects on the Stacking Fault Exciton States in BiI₃

  I.Akai, T.Karasawa, T.Komatsu

  Digest of Nonlinear Optics: Materials, Phenomena and Devices, 1990 Hawaii USA

International Conferences

• Temporal Behavior of the Optical Stark Effects on the Stacking Fault Exciton States in BiI₃

  I.Akai, T.Karasawa, T.Komatsu

  Nonlinear Optics: Materials, Phenomena and Devices, 1990 Hawaii USA

• Observation of Propagation of Exciton-Polaritons along Stacking Fault Plane in Layered Crystal BiI₃

  T.Kawai, S.Shimanuki, T.Karasawa, I.Akai, T.Iida, T.Komatsu

  The International Conference on Luminescence '90, 1990 Lisbon Portugal

 1989

• The Photocalorimetric Spectra in Layered BiI₃ Single Crystals

  I.Akai, T.Karasawa, Y.Kaifu

  J. Phys. Soc. Jpn 58 p.718-725 (1989)

• Picosecond Studies of Cascade Relaxation Processes among the Stacking Fault Exciton States in Layered BiI₃ Single Crystals

  I.Akai, T.Karasawa, Y.Kaifu, A.Nakamura, M.Shimura, M.Hirai

  J. Lumin. 42 p.357-363 (1989)

• Space-Resolved Spectra Due to High Mobile Exciton at the Stacking Fault in BiI₃ Crystals

  T.Kawai, I.Akai, T.Karasawa

  J. Phys. Soc. Jpn 58 p.969-977 (1989)

 1988

• Large Optical Nonlinearity of the Two-Dimensional Exciton States at a Stacking Fault Interface in BiI₃

  I.Akai, T.Karasawa, T.Komatsu, Y.Kaifu

  phys. stat. sol. (b) 150 p.635-639 (1988)

• The First Observation of k-Space Non-Radiative Process by the Photo-Calorimetric Spectroscopy on the Stacking Fault Excitons

  I.Akai, T.Karasawa, T.Komatsu, Y.Kaifu

  Proceeding of 19th International Conference on Physics of Semiconductors (Inst. of Phys. Polish Academy of Science) 1 p.425-428 (1988)

• Ultrafast Optical Dephasing of Two-Dimensional Excitons in BiI₃

  A.Nakamura, Y.Ishida, T.Yajima, T.Karasawa, I.Akai, Y.Kaifu

  Springer Series in Chemical Physics 48 Ultrafast Phenomena VI, p.266-268. (1988)

• Space- and Time-Resolved Spectroscopy of the Ultrafast Exciton Motion at a Stacking Fault Interface in Layered BiI₃ Crystals

  T.Karasawa, T.Kawai, I.Akai, Y.Kaifu

  Springer Series in Chemical Physics 48 Ultrafast Phenomena VI, p.262-265. (1988)

• Observation of High Mobile Excitons along the Stacking Fault Plane in BiI₃ by Space-Resolved Spectroscopy

  T.Karasawa, T.Kawai, I.Akai, Y.Kaifu

  J. Lumin. 40&41 p.431-432 (1988)  

International Conferences

• Large Optical Nonlinearity of the Two-Dimensional Exciton States at a Stacking Fault Interface in BiI₃

  I.Akai, T.Karasawa, T.Komatsu, Y.Kaifu

  International Conference on Optical Nonlinearities and Bistability of Semiconductors, 1988 Berlin East Germany

• The First Observation of k-Space Non-Radiative Process by the Photo-Calorimetric Spectroscopy on the Stacking Fault Excitons

  I.Akai, T.Karasawa, T.Komatsu, Y.Kaifu

  19th International Conference on the Physics of Semiconductors, 1988 Warsaw Poland

• Ultrafast Optical Dephasing of Two-Dimensional Excitons in BiI₃

  A.Nakamura, Y.Ishida, T.Yajima, T.Karasawa, I.Akai, Y.Kaifu

  Ultrafast Phenomena VI, 1988 Kyoto Japan

• Space- and Time-Resolved Spectroscopy of the Ultrafast Exciton Motion at a Stacking Fault Interface in Layered BiI₃ Crystals

  T.Karasawa, T.Kawai, I.Akai, Y.Kaifu

  Ultrafast Phenomena VI, 1988 Kyoto Japan