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Edge and interfacial states in a two-dimensional topological insulator: Bi(111) bilayer on Bi2Te2Se SCIE SCOPUS

Title
Edge and interfacial states in a two-dimensional topological insulator: Bi(111) bilayer on Bi2Te2Se
Authors
Sung Hwan KimKyung-Hwan JinJoonbum ParkKim, JSSeung-Hoon JhiTae-Hwan KimHan Woong Yeom
Date Issued
2014-04-29
Publisher
American Physical Society
Abstract
The electronic states of a single Bi(111) bilayer and its edges, suggested as a two-dimensional topological insulator, are investigated by scanning tunneling spectroscopy (STS) and first-principles calculations. Well-ordered bilayer films and islands with zigzag edges are grown epitaxially on a cleaved Bi2Te2Se crystal. The calculation shows that the band gap of the Bi bilayer closes with a formation of a new but small hybridization gap due to the strong interaction between Bi and Bi2Te2Se. Nevertheless, the topological nature of the Bi bilayer and the topological edge state are preserved only with an energy shift. The edge-enhanced local density of states are identified and visualized unambiguously by STS in good agreement with the calculation. This is a clear sign of the topological edge state, which corresponds to the quantum spin Hall state. The interfacial state between Bi and Bi2Te2Se is also identified inside the band gap region. This state exhibits a subtle edge modulation, which was previously interpreted as the evidence of the topological edge state.
URI
https://oasis.postech.ac.kr/handle/2014.oak/13551
DOI
10.1103/PHYSREVB.89.155436
ISSN
1098-0121
Article Type
Article
Citation
PHYSICAL REVIEW B, vol. 89, no. 15, page. 155436, 2014-04-29
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