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Journal Articles

Temperature-dependent spectral linewidths of terahertz Bloch oscillations in biased semiconductor superlattices

Takeya Unuma, Aleph Matsuda
Journal: Applied Physics Letters
Appl. Phys. Lett. 112, 162107 (2018)
https://doi.org/10.1063/1.5024342
Published: April 2018
View article titled, Temperature-dependent spectral linewidths of terahertz Bloch oscillations in biased semiconductor superlattices
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Journal Articles

Anisotropic terahertz complex conductivities in oriented polythiophene films

Takeya Unuma, Atsuhiro Umemoto, Hideo Kishida
Journal: Applied Physics Letters
Appl. Phys. Lett. 103, 213305 (2013)
https://doi.org/10.1063/1.4833400
Published: November 2013
View article titled, Anisotropic terahertz complex conductivities in oriented polythiophene films
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Journal Articles

Direct observation of carrier delocalization in highly conducting polyaniline

Takeya Unuma, Naruki Yamada, Arao Nakamura, Hideo Kishida, Seung-Chul Lee, Eun-Young Hong, Suck-Hyun Lee, O-Pil Kwon
Journal: Applied Physics Letters
Appl. Phys. Lett. 103, 053303 (2013)
https://doi.org/10.1063/1.4817546
Published: August 2013
View article titled, Direct observation of carrier delocalization in highly conducting polyaniline
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Journal Articles

Dispersion relations for evaluating the complex refractive index of medium without the information of its thickness

Kai-Erik Peiponen, Erik M. Vartiainen, Takeya Unuma, J. Axel Zeitler, Pertti Silfsten, Tapani Venäläinen, Hideo Kishida
Journal: Applied Physics Letters
Appl. Phys. Lett. 102, 181110 (2013)
https://doi.org/10.1063/1.4804610
Published: May 2013
View article titled, Dispersion relations for evaluating the complex refractive index of medium without the information of its thickness
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Journal Articles

Intersubband transition energy and linewidth modified by a submonolayer AlAs insertion into GaAs quantum wells

Takeya Unuma, Soichirou Takata, Yohei Sakasegawa, Kazuhiko Hirakawa, Arao Nakamura
Journal: Journal of Applied Physics
J. Appl. Phys. 109, 043506–043506-4 (2011)
https://doi.org/10.1063/1.3549126
Published: February 2011
View article titled, Intersubband transition energy and linewidth modified by a submonolayer AlAs insertion into GaAs quantum wells
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Journal Articles

Terahertz complex conductivities of carriers with partial localization in doped polythiophenes

Takeya Unuma, Kenji Fujii, Hideo Kishida, Arao Nakamura
Journal: Applied Physics Letters
Appl. Phys. Lett. 97, 033308 (2010)
https://doi.org/10.1063/1.3466916
Published: July 2010
View article titled, Terahertz complex conductivities of carriers with partial localization in doped polythiophenes
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Journal Articles

Single‐particle Nature of Intersubband Electronic Raman Scattering and Dynamical Many‐body Effects in Narrow GaAs Quantum Wells

Takeya Unuma, Kensuke Kobayashi, Aishi Yamamoto, Masahiro Yoshita, Kazuhiko Hirakawa, Yoshiaki Hashimoto, Shingo Katsumoto, Yasuhiro Iye, Yoshihiko Kanemitsu, Hidefumi Akiyama
Journal: AIP Conference Proceedings
AIP Conf. Proc. 893, 475–476 (2007)
https://doi.org/10.1063/1.2729972
Published: April 2007
View article titled, Single‐particle Nature of Intersubband Electronic Raman Scattering and Dynamical Many‐body Effects in Narrow GaAs Quantum Wells
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Journal Articles

Dephasing of Bloch Oscillations due to Interface Roughness Scattering in GaAs/AlAs Superlattices

Takeya Unuma, Norihiko Sekine, Kazuhiko Hirakawa
Journal: AIP Conference Proceedings
AIP Conf. Proc. 893, 495–496 (2007)
https://doi.org/10.1063/1.2729982
Published: April 2007
View article titled, Dephasing of Bloch Oscillations due to Interface Roughness Scattering in GaAs/AlAs Superlattices
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Journal Articles

Intersubband absorption linewidth in GaAs quantum wells due to scattering by interface roughness, phonons, alloy disorder, and impurities

Takeya Unuma, Masahiro Yoshita, Takeshi Noda, Hiroyuki Sakaki, Hidefumi Akiyama
Journal: Journal of Applied Physics
J. Appl. Phys. 93, 1586–1597 (2003)
https://doi.org/10.1063/1.1535733
Published: February 2003
View article titled, Intersubband absorption linewidth in GaAs quantum wells due to scattering by interface roughness, phonons, alloy disorder, and impurities
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Journal Articles

Effects of interface roughness and phonon scattering on intersubband absorption linewidth in a GaAs quantum well

Takeya Unuma, Teruyuki Takahashi, Takeshi Noda, Masahiro Yoshita, Hiroyuki Sakaki, Motoyoshi Baba, Hidefumi Akiyama
Journal: Applied Physics Letters
Appl. Phys. Lett. 78, 3448–3450 (2001)
https://doi.org/10.1063/1.1376154
Published: May 2001
View article titled, Effects of interface roughness and phonon scattering on intersubband absorption linewidth in a GaAs quantum well
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