• 文献标题:   Low-energy theory for strained graphene: an approach up to second-order in the strain tensor
  • 文献类型:   Article
  • 作  者:   OLIVALEYVA M, WANG CM
  • 作者关键词:   graphene, strain, dirac hamiltonian, optical conductivity, light transmittance
  • 出版物名称:   JOURNAL OF PHYSICSCONDENSED MATTER
  • ISSN:   0953-8984 EI 1361-648X
  • 通讯作者地址:   Univ Nacl Autonoma Mexico
  • 被引频次:   8
  • DOI:   10.1088/1361-648X/aa62c9
  • 出版年:   2017

▎ 摘  要

An analytical study of low-energy electronic excited states in uniformly strained graphene is carried out up to second-order in the strain tensor. We report a new effective Dirac Hamiltonian with an anisotropic Fermi velocity tensor, which reveals the graphene trigonal symmetry being absent in first-order low-energy theories. In particular, we demonstrate the dependence of the Dirac-cone elliptical deformation on the stretching direction with respect to graphene lattice orientation. We further analytically calculate the optical conductivity tensor of strained graphene and its transmittance for a linearly polarized light with normal incidence. Finally, the obtained analytical expression of the Dirac point shift allows a better determination and understanding of pseudomagnetic fields induced by nonuniform strains.