2016/05/31 by Suguru Ito, S. Ito, Baojie Feng +25
Mathematics · Physics and Astronomy · #Bismuth #Combinatorics #Materials science #Mathematics #Physics #Quantum #Quantum and electron transport phenomena #Quantum dot #Quantum mechanics #Surface and Thin Film Phenomena #Theoretical physics #Topological Materials and Phenomena #Topology (electrical circuits) #cond-mat.mtrl-sci
paper · pdf · doi:10.1103/physrevlett.117.236402
published as Phys. Rev. Lett. 117, 236402 (2016) · 6 pages, 5 figures
openalex publication_date 2016/12/02 · arxiv created 2016/12/03 · arxiv updated 2016/12/06 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06
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.