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タイトル: Quantum Hall effect on top and bottom surface states of topological insulator (Bi1−xSbx)2Te3 films
著者: Yoshimi, R.
Tsukazaki, A.
Kozuka, Y.
Falson, J.
Takahashi, K. S.
Checkelsky, J. G.
Nagaosa, N.
Kawasaki, M.
Tokura, Y.
キーワード: Physical sciences
Applied physics
Condensed matter
発行日: 2015年4月14日
出版者: Nature Publishing Group
掲載誌情報: R. Yoshimi, A. Tsukazaki, Y. Kozuka, J. Falson, K. S. Takahashi, J. G. Checkelsky, N. Nagaosa, M. Kawasaki and Y. Tokura, "Quantum Hall effect on top and bottom surface states of topological insulator (Bi1-xSbx)2Te3 films", Nature Communications Online Edition: 2015/4/14 (Japan time), doi:10.1038/ncomms7627.
関連URI: http://www.u-tokyo.ac.jp/ja/utokyo-research/research-news/observation-of-quantization-in-surface-dirac-states-of-topological-insulator.html
抄録: The three-dimensional topological insulator is a novel state of matter characterized by two-dimensional metallic Dirac states on its surface. To verify the topological nature of the surface states, Bi-based chalcogenides such as Bi2Se3, Bi2Te3, Sb2Te3 and their combined/mixed compounds have been intensively studied. Here, we report the realization of the quantum Hall effect on the surface Dirac states in (Bi1−xSbx)2Te3 films. With electrostatic gate-tuning of the Fermi level in the bulk band gap under magnetic fields, the quantum Hall states with filling factor ±1 are resolved. Furthermore, the appearance of a quantum Hall plateau at filling factor zero reflects a pseudo-spin Hall insulator state when the Fermi level is tuned in between the energy levels of the non-degenerate top and bottom surface Dirac points. The observation of the quantum Hall effect in three-dimensional topological insulator films may pave a way toward topological insulator-based electronics.
内容記述: UTokyo Research掲載「トポロジカル絶縁体の表面ディラック状態の量子化を実証」 URI: http://www.u-tokyo.ac.jp/ja/utokyo-research/research-news/observation-of-quantization-in-surface-dirac-states-of-topological-insulator.html
UTokyo Research "Observation of quantization in surface Dirac states of topological insulator" URI: http://www.u-tokyo.ac.jp/en/utokyo-research/research-news/observation-of-quantization-in-surface-dirac-states-of-topological-insulator.html
URI: http://hdl.handle.net/2261/58607
ISSN: 2041-1723 (online)
出現カテゴリ:014 自然科学
1132610 学術雑誌論文


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