Proving Nontrivial Topology of Pure Bismuth by Quantum Confinement

S. Ito, B. Feng, M. Arita, A. Takayama, R. Y. Liu, T. Someya, W. C. Chen, T. Iimori, H. Namatame, M. Taniguchi, C. M. Cheng, S. J. Tang, F. Komori, K. Kobayashi, T. C. Chiang, I. Matsuda

研究成果: Article査読

53 被引用数 (Scopus)

抄録

The topology of pure Bi is controversial because of its very small (∼10 meV) band gap. Here we perform high-resolution angle-resolved photoelectron spectroscopy measurements systematically on 14-202 bilayer Bi films. Using high-quality films, we succeed in observing quantized bulk bands with energy separations down to ∼10 meV. Detailed analyses on the phase shift of the confined wave functions precisely determine the surface and bulk electronic structures, which unambiguously show nontrivial topology. The present results not only prove the fundamental property of Bi but also introduce a capability of the quantum-confinement approach.

本文言語English
論文番号236402
ジャーナルPhysical Review Letters
117
23
DOI
出版ステータスPublished - 2016 12 2
外部発表はい

ASJC Scopus subject areas

  • 物理学および天文学(全般)

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