• 文献标题:   Strain and curvature induced evolution of electronic band structures in twisted graphene bilayer
  • 文献类型:   Article
  • 作  者:   YAN W, HE WY, CHU ZD, LIU MX, MENG L, DOU RF, ZHANG YF, LIU ZF, NIE JC, HE L
  • 作者关键词:  
  • 出版物名称:   NATURE COMMUNICATIONS
  • ISSN:   2041-1723
  • 通讯作者地址:   Beijing Normal Univ
  • 被引频次:   87
  • DOI:   10.1038/ncomms3159
  • 出版年:   2013

▎ 摘  要

It is well established that strain and geometry could affect the band structure of graphene monolayer dramatically. Here we study the evolution of local electronic properties of a twisted graphene bilayer induced by a strain and a high curvature, which are found to strongly affect the local band structures of the twisted graphene bilayer. The energy difference of the two low-energy van Hove singularities decreases with increasing lattice deformation and the states condensed into well-defined pseudo-Landau levels, which mimic the quantization of massive chiral fermions in a magnetic field of about 100 T, along a graphene wrinkle. The joint effect of strain and out-of-plane distortion in the graphene wrinkle also results in a valley polarization with a significant gap. These results suggest that strained graphene bilayer could be an ideal platform to realize the high-temperature zero-field quantum valley Hall effect.