Unusually Large Enhancement of Thermopower in an Electric Field Induced Two-Dimensional Electron Gas

Authors

  • Hiromichi Ohta,

    Corresponding author
    1. Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa, Nagoya 464–8603, Japan/PRESTO, Japan Science and Technology Agency, 7 Gobancho, Chiyoda, Tokyo 102–0075, Japan
    • Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa, Nagoya 464–8603, Japan/PRESTO, Japan Science and Technology Agency, 7 Gobancho, Chiyoda, Tokyo 102–0075, Japan.
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  • Taku Mizuno,

    1. Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa, Nagoya 464–8603, Japan
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  • Shijian Zheng,

    1. Nanostructures Research Laboratory, Japan Fine Ceramics Center, 2–4–1 Mutsuno, Atsuta, Nagoya 456–8587, Japan
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  • Takeharu Kato,

    1. Nanostructures Research Laboratory, Japan Fine Ceramics Center, 2–4–1 Mutsuno, Atsuta, Nagoya 456–8587, Japan
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  • Yuichi Ikuhara,

    1. Nanostructures Research Laboratory, Japan Fine Ceramics Center, 2–4–1 Mutsuno, Atsuta, Nagoya 456–8587, Japan/Institute of Engineering Innovation, The University of Tokyo, 2–11–16 Yayoi, Bunkyo, Tokyo 113–8656, Japan
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  • Katsumi Abe,

    1. Canon Inc., 3–30–2 Shimomaruko, Ohta-ku, Tokyo 146–8501, Japan/Frontier Research Center, Tokyo Institute of Technology, 4259 Nagatsuta, Midori, Yokohama 226–8503, Japan
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  • Hideya Kumomi,

    1. Canon Inc., 3–30–2 Shimomaruko, Ohta-ku, Tokyo 146–8501, Japan
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  • Kenji Nomura,

    1. Frontier Research Center, Tokyo Institute of Technology, 4259 Nagatsuta, Midori, Yokohama 226–8503, Japan
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  • Hideo Hosono

    1. Frontier Research Center, Tokyo Institute of Technology, 4259 Nagatsuta, Midori, Yokohama 226–8503, Japan
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Abstract

original image

Unusually large thermopower modulation is demonstrated using a field effect transistor structure on a thermoelectric material. An electric field application provides an extremely thin (∼2 nm) two-dimensional electron gas (2DEG), which exhibits unusually large thermopower, approximately five times larger than that of the bulk. The present electric field induced 2DEG approach may accelerate the development of nanostructures for high performance thermoelectric materials.

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