• 文献标题:   Moire disorder effect in twisted bilayer graphene
  • 文献类型:   Article
  • 作  者:   NAKATSUJI N, KOSHINO M
  • 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:  
  • 被引频次:   1
  • DOI:   10.1103/PhysRevB.105.245408
  • 出版年:   2022

▎ 摘  要

We theoretically study the electronic structure of magic-angle twisted bilayer graphene with disordered moir?? patterns. By using an extended continuum model incorporating nonuniform lattice distortion, we find that the local density of states of the flat band is hardly broadened, but splits into upper and lower subbands in most places. The spatial dependence of the splitting energy is almost exclusively determined by the local value of the effective vector potential induced by heterostrain, whereas the variation of local twist angle and local moir?? period give relatively minor effects on the electronic structure. We explain the exclusive dependence on the local vector potential by a pseudo Landau level picture for the magic-angle flat band, and we obtain an analytic expression of the splitting energy as a function of the strain amplitude.