• 文献标题:   Space Dependent Fermi Velocity in Strained Graphene
  • 文献类型:   Article
  • 作  者:   DE JUAN F, STURLA M, VOZMEDIANO MAH
  • 作者关键词:  
  • 出版物名称:   PHYSICAL REVIEW LETTERS
  • ISSN:   0031-9007 EI 1079-7114
  • 通讯作者地址:   Indiana Univ
  • 被引频次:   105
  • DOI:   10.1103/PhysRevLett.108.227205
  • 出版年:   2012

▎ 摘  要

We investigate some apparent discrepancies between two different models for curved graphene: the one based on tight-binding and elasticity theory, and the covariant approach based on quantum field theory in curved space. We demonstrate that strained or corrugated samples will have a space-dependent Fermi velocity in either approach that can affect the interpretation of local probe experiments in graphene. We also generalize the tight-binding approach to general inhomogeneous strain and find a gauge field proportional to the derivative of the strain tensor that has the same form as the one obtained in the covariant approach.