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Spin-orbit coupling-induced band inversion and spin Chern insulator phase in plumbene and stanene

Authors
Lee, Kyu WonLee, Cheol Eui
Issue Date
3월-2020
Publisher
ELSEVIER
Keywords
Plumbene; Stanene; Band inversion; Z(2) topology; Spin Chern insulator
Citation
CURRENT APPLIED PHYSICS, v.20, no.3, pp.413 - 418
Indexed
SCIE
SCOPUS
KCI
Journal Title
CURRENT APPLIED PHYSICS
Volume
20
Number
3
Start Page
413
End Page
418
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/57551
DOI
10.1016/j.cap.2019.12.009
ISSN
1567-1739
Abstract
Z(2) topology in two-dimensional group IVA materials has been explained by the band orders due to the crystal field splitting at the point in the Brillouin zone, while spin-orbit coupling (SOC) was considered just to open a band gap. By using a multi-orbital tight-binding model, we show that the SOC induces band inversion between the conduction and valence bands at the point in plumbene, which also is the case in stanene when the SOC strength increases. As a result of the band inversion, plumbene becomes a spin Chern insulator with a spin Chern number C-S = 2 and, as the SOC strength increases, stanene undergoes a topological phase transition from a Z(2) topological insulator to a spin Chern insulator with C-S = 2. Under a staggered AB-sublattice potential, plumbene undergoes a phase transition from the spin Chern insulator with C-S = 2 to a Z(2) topological insulator with C-S = 1.
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