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

Kyu Won Lee, Cheol Eui Lee

Research output: Contribution to journalArticle

Abstract

Z2 topology in two-dimensional group IVA materials has been explained by the band orders due to the crystal field splitting at the Γ 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 Γ 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 CS = 2 and, as the SOC strength increases, stanene undergoes a topological phase transition from a Z2 topological insulator to a spin Chern insulator with CS = 2. Under a staggered AB-sublattice potential, plumbene undergoes a phase transition from the spin Chern insulator with CS = 2 to a Z2 topological insulator with CS = 1.

Original languageEnglish
Pages (from-to)413-418
Number of pages6
JournalCurrent Applied Physics
Volume20
Issue number3
DOIs
Publication statusPublished - 2020 Mar

Keywords

  • Band inversion
  • Plumbene
  • Spin Chern insulator
  • Stanene
  • Z topology

ASJC Scopus subject areas

  • Materials Science(all)
  • Physics and Astronomy(all)

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