• 文献标题:   The longitudinal optical conductivity in bilayer graphene and other two-dimensional systems
  • 文献类型:   Article
  • 作  者:   YANG CH, AO ZM, WEI XF, JIANG JJ
  • 作者关键词:   graphene, optical conductivity, dielectric function, two dimensional electron ga
  • 出版物名称:   PHYSICA BCONDENSED MATTER
  • ISSN:   0921-4526 EI 1873-2135
  • 通讯作者地址:   Nanjing Univ Informat Sci Technol
  • 被引频次:   3
  • DOI:   10.1016/j.physb.2014.09.036
  • 出版年:   2015

▎ 摘  要

The longitudinal optical conductivity in bilayer graphene is calculated using the dielectric function by defining the density operator theoretically, while the effect of the broadening width determined by the scattering sources on the optical conductivity is also investigated. Some features, such as chirality, energy dispersion and density of state (DOS) in bilayer graphene, are similar to those in monolayer graphene and a traditional two-dimensional electron gas (2DEG). Therefore, in this paper, the bilayer graphene optical conductivity is compared with the results in these two systems. The analytical and numerical results show that the optical conductivity per graphene layer is almost a constant and close to e(2)/(4 (h) over bar), which agrees with the experimental results. (C) 2014 Elsevier B.V. All rights reserved.