title: Strain and curvature induced evolution of electronic band structures in twisted graphene bilayer.
abstract: 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.
authors.affiliation: Department of Physics, Beijing Normal University, Beijing 100875, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Yan
authors.forename: Wen-Yu
authors.initials: WY
authors.lastname: He
authors.forename: Zhao-Dong
authors.initials: ZD
authors.lastname: Chu
authors.forename: Mengxi
authors.initials: M
authors.lastname: Liu
authors.forename: Lan
authors.initials: L
authors.lastname: Meng
authors.forename: Rui-Fen
authors.initials: RF
authors.lastname: Dou
authors.forename: Yanfeng
authors.initials: Y
authors.lastname: Zhang
authors.forename: Zhongfan
authors.initials: Z
authors.lastname: Liu
authors.forename: Jia-Cai
authors.initials: JC
authors.lastname: Nie
authors.forename: Lin
authors.initials: L
authors.lastname: He