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Suppression of supercollision carrier cooling in high mobility graphene on SiC(0001¯)

Takashi Someya, Hirokazu Fukidome, Hiroshi Watanabe, Takashi Yamamoto, Masaru Okada, Hakuto Suzuki, Yu Ogawa, Takushi Iimori, Nobuhisa Ishii, Teruto Kanai, Keiichiro Tashima, Baojie Feng, Susumu Yamamoto, Jiro Itatani, Fumio Komori, Kozo Okazaki, Shik Shin, and Iwao Matsuda
Phys. Rev. B 95, 165303 – Published 19 April 2017
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Abstract

Graphene, a two-dimensional carbon crystal with a gas of massless Dirac fermions, has promise as a material that is useful in photonic and optoelectronic devices. A comprehensive understanding of carrier cooling in photoexcited graphene is necessary for their applications, however, as competing cooling processes, electron-phonon scattering, and supercollisions, complicate the problem. Specifically, in energy harvesting, supercollision promotes further carrier cooling and, therefore, leads to lower efficiency, placing doubt on the feasibility of device applications. Here we present evidence of suppressed supercollisions in trilayer graphene on a SiC(0001¯) substrate by directly observing photoexcited carriers and numerically analyzing a phenomenological two-temperature model. Knowing that supercollisions restrict the capabilities of graphene-based devices, our results provide a breakthrough for improving their performance.

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  • Received 8 December 2016
  • Revised 15 March 2017

DOI:https://doi.org/10.1103/PhysRevB.95.165303

©2017 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Takashi Someya1, Hirokazu Fukidome2, Hiroshi Watanabe3, Takashi Yamamoto1, Masaru Okada1, Hakuto Suzuki4, Yu Ogawa1, Takushi Iimori1, Nobuhisa Ishii1, Teruto Kanai1, Keiichiro Tashima2, Baojie Feng1, Susumu Yamamoto1, Jiro Itatani1, Fumio Komori1, Kozo Okazaki1, Shik Shin1, and Iwao Matsuda1,*

  • 1Institute for Solid State Physics, The University of Tokyo, Kashiwa-no-ha, Kashiwa, Chiba 277-8581, Japan
  • 2Research Institute of Electrical Communication, Tohoku University, 2-1-1 Katahira, Aobaku-ku, Sendai, Miyagi 980-8577, Japan
  • 3Graduate School of Frontier Biosciences, Osaka University, Suita 565-0871, Japan
  • 4Department of Physics, School of Science, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan

  • *imatsuda@issp.u-tokyo.ac.jp

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Issue

Vol. 95, Iss. 16 — 15 April 2017

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