期刊
PHYSICAL REVIEW B
卷 85, 期 11, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.85.115426
关键词
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资金
- Japan Society for the Promotion of Science [22656011, 23686007]
- JGC-S Scholarship Foundation
- Grants-in-Aid for Scientific Research [22656011, 23686007] Funding Source: KAKEN
The surface structure of topological insulators Bi2Te3(111) and a single bilayer bismuth on it was studied by low-energy electron-diffraction analysis. The topmost quintuple layer of Bi2Te3 showed only a slight relaxation (similar to 1% contraction). On the other hand, the bilayer Bi was strongly distorted compared to bulk Bi (3.5% in-plane contraction and similar to 7% out-of-plane expansion). First-principles calculation reveals that this distortion has a large influence on the electronic structure and can enlarge the band gap.
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