Details

Autor(en) / Beteiligte

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

Titel

Proving Nontrivial Topology of Pure Bismuth by Quantum Confinement

Ist Teil von

• Physical review letters, 2016-12, Vol.117 (23), p.236402-236402, Article 236402

Ort / Verlag

United States

Erscheinungsjahr

2016

Link zum Volltext

Quelle

American Physical Society

Beschreibungen/Notizen

• 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.