論文 - 小山 剛史
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Two-Step Excitation Triggered by One-Photon Absorption on Linear Dispersion in Monolayer Graphene 査読有り
Takeshi Koyama*, Kenta Mizutani, Hiroki Ago, and Hideo Kishida
The Journal of Physical Chemistry C 120 巻 ( 20 ) 頁： 11225 - 11229 2016年5月
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Near-Infrared Photoluminescence Properties of Endohedral Mono- and Dithulium Metallofullerenes 査読有り
Zhiyong Wang, Noriko Izumi, Yusuke Nakanishi, Takeshi Koyama, Toshiki Sugai, Masayoshi Tange, Toshiya Okazaki, and Hisanori Shinohara*
ACS Nano 10 巻 ( 4 ) 頁： 4282 - 4287 2016年4月
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Ultrafast Energy Transfer from Fluorene Polymers to Single-Walled Carbon Nanotubes in Wrapped Carbon Nanotube Bundles 査読有り
Arao Nakamura*, Takeshi Koyama, Yasumitsu Miyata, and Hisanori Shinohara
The Journal of Physical Chemistry C 120 巻 ( 8 ) 頁： 4647 - 4652 2016年3月
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Ultrafast excitation energy transfer from encapsulated quaterrylene to single-walled carbon nanotube 査読有り
Takeshi Koyama*, Takuya Tsunekawa, Takeshi Saito, Koji Asaka, Yahachi Saito, Hideo Kishida, and Arao Nakamura
Journal of Luminescence 169 巻 ( B ) 頁： 645 - 648 2016年1月
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Photoluminescence of poly(3,4-ethylenedioxythiophene)/poly(styrenesulfonate) in the visible region 査読有り
Takeshi Koyama*, Taiki Matsuno, Yasunori Yokoyama, and Hideo Kishida
Journal of Materials Chemistry C 3 巻 ( 32 ) 頁： 8307 - 8310 2015年8月
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Synthesis and Photophysics of Quaterrylene Molecules in Single-Walled Carbon Nanotubes: Excitation Energy Transfer between a Nanoscale Cylinder and Encapsulated Molecules 査読有り
Takeshi Koyama*, Takuya Tsunekawa, Takeshi Saito, Koji Asaka, Yahachi Saito, Hideo Kishida, and Arao Nakamura
The Journal of Physical Chemistry C 118 巻 ( 37 ) 頁： 21671-21681 2014年9月
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Microscopic Mobility of Polarons in Chemically Doped Polythiophenes Measured by Employing Photoluminescence Spectroscopy 査読有り
Takeshi Koyama*, Arao Nakamura, and Hideo Kishida
ACS Photonics 1 巻 ( 8 ) 頁： 655-661 2014年8月
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Trion dynamics in hole-doped single-walled carbon nanotubes 査読有り
Arao Nakamura*, Satoru Shimizu, Takeshi Koyama, Yasumitsu Miyata, and Hisanori Shinohara
AIP Conference Proceedings 1566 巻 頁： 163-164 2013年12月
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Dynamics of photoexcited carriers in monolayer epitaxial graphene probed by photoluminescence in the near-infrared region 査読有り
Takeshi Koyama*, Yoshito Ito, Kazuma Yoshida, Hiroki Ago, and Arao Nakamura
AIP Conference Proceedings 1566 巻 頁： 167-168 2013年12月
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Transient Absorption Kinetics Associated with Higher Exciton States in Semiconducting Single-Walled Carbon Nanotubes: Relaxation of Excitons and Phonons 査読有り
Takeshi Koyama*, Shohei Yoshimitsu, Yasumitsu Miyata, Hisanori Shinohara, Hideo Kishida, and Arao Nakamura
The Journal of Physical Chemistry C 117 巻 ( 39 ) 頁： 20289-20299 2013年10月
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Ultrafast formation and decay dynamics of trions in p-doped single-walled carbon nanotubes 査読有り
Takeshi Koyama*, Satoru Shimizu, Yasumitsu Miyata, Hisanori Shinohara, and Arao Nakamura
Physical Review B 87 巻 ( 16 ) 頁： 165430/1-6 2013年4月
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Near-Infrared Photoluminescence in the Femtosecond Time Region in Monolayer Graphene on SiO2 査読有り
Takeshi Koyama*, Yoshito Ito, Kazuma Yoshida, Masaharu Tsuji, Hiroki Ago, Hideo Kishida, and Arao Nakamura
ACS Nano 7 巻 ( 3 ) 頁： 2335-2343 2013年3月
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Photophysics in Single-Walled Carbon Nanotubes with (6,4) Chirality at High Excitation Densities: Bimolecular Auger Recombination and Phase-Space Filling of Excitons 査読有り
Takeshi Koyama*, Yasumitsu Miyata, Hideo Kishida, Hisanori Shinohara, and Arao Nakamura
The Journal of Physical Chemistry C 117 巻 ( 4 ) 頁： 1974-1981 2013年1月
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Ultrafast energy transfer of one-dimensional excitons between carbon nanotubes: a femtosecond time-resolved luminescence study 招待有り 査読有り
Takeshi Koyama*, Yasumitsu Miyata, Koji Asaka, Hisanori Shinohara, Yahachi Saito, and Arao Nakamura
Physical Chemistry Chemical Physics 14 巻 ( 3 ) 頁： 1070-1084 2012年1月
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Ultrafast luminescence kinetics of metallic single-walled carbon nanotubes: Possible evidence for excitonic luminescence 査読有り
Takeshi Koyama*, Satoru Shimizu, Takeshi Saito, Yasumitsu Miyata, Hisanori Shinohara, and Arao Nakamura
Physical Review B 85 巻 ( 4 ) 頁： 045428/1-7 2012年1月
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Exciton Energy Transfer between Single-Walled Carbon Nanotubes in Femtosecond Regime 査読有り
Takeshi Koyama*, Koji Asaka, Naoki Hikosaka, Hideo Kishida, Yahachi Saito, and Arao Nakamura
AIP Conference Proceedings 1399 巻 頁： 759-760 2011年12月
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Enhancement of Third-Order Optical Nonlinearities in Carbon Nanotubes by Encapsulated Fullerenes 査読有り
D. Hosooka, T. Koyama, H. Kishida, K. Asaka, Y. Saito, T. Saito, and A. Nakamura*
AIP Conference Proceedings 1399 巻 頁： 831-832 2011年12月
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Ultrafast Exciton Energy Transfer between Nanoscale Coaxial Cylinders: Intertube Transfer and Luminescence Quenching in Double-Walled Carbon Nanotubes 査読有り
Takeshi Koyama*, Yuki Asada, Naoki Hikosaka, Yasumitsu Miyata, Hisanori Shinohara, and Arao Nakamura
ACS Nano 5 巻 ( 7 ) 頁： 5881-5887 2011年7月
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Dynamics of nuclear wave packets at the F center in alkali halides 査読有り
Takeshi Koyama* and Tohru Suemoto
Reports on Progress in Physics 74 巻 ( 7 ) 頁： 076502/1-22 2011年7月
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Femtosecond luminescence decay due to exciton energy transfer in single-walled carbon nanotube bundles 査読有り
Takeshi Koyama*, Koji Asaka, Naoki Hikosaka, Hideo Kishida, Yahachi Saito, and Arao Nakamura
Journal of Luminescence 131 巻 ( 3 ) 頁： 494-497 2011年3月