• 文献标题:   Competition of topological and topologically trivial phases in patterned graphene based heterostructures
  • 文献类型:   Article
  • 作  者:   TAJKOV Z, KOLTAI J, CSERTI J, OROSZLANY L
  • 作者关键词:  
  • 出版物名称:   PHYSICAL REVIEW B
  • ISSN:   2469-9950 EI 2469-9969
  • 通讯作者地址:   Eotvos Lorand Univ
  • 被引频次:   2
  • DOI:   10.1103/PhysRevB.101.235146
  • 出版年:   2020

▎ 摘  要

We explore the effect of mechanical strain on the electronic spectrum of patterned graphene based heterostructures. We focus on the competition of Kekule-O type distortion favoring a trivial phase and commensurate Kane-Mele type spin-orbit coupling generating a topological phase. We derive a simple low-energy Dirac Hamiltonian incorporating the two gap promoting mechanisms and include terms corresponding to uniaxial strain. The derived effective model explains previous ab initio results through a simple physical picture. We show that while the trivial gap is sensitive to mechanical distortions, the topological gap stays resilient.