• 文献标题:   Optical conductivity of curved graphene
  • 文献类型:   Article
  • 作  者:   CHAVES AJ, FREDERICO T, OLIVEIRA O, DE PAULA W, SANTOS MC
  • 作者关键词:   graphene, optical conductivity, dirac equation, curved graphene
  • 出版物名称:   JOURNAL OF PHYSICSCONDENSED MATTER
  • ISSN:   0953-8984 EI 1361-648X
  • 通讯作者地址:   DCTA
  • 被引频次:   12
  • DOI:   10.1088/0953-8984/26/18/185301
  • 出版年:   2014

▎ 摘  要

We compute the optical conductivity for an out-of-plane deformation in graphene using an approach based on solutions of the Dirac equation in curved space. Different examples of periodic deformations along one direction translates into an enhancement of the optical conductivity peaks in the region of the far-and mid-infrared frequencies for periodicities similar to 100 nm. The width and position of the peaks can be changed by dialling the parameters of the deformation profiles. The enhancement of the optical conductivity is due to intraband transitions and the translational invariance breaking in the geometrically deformed background. Furthermore, we derive an analytical solution of the Dirac equation in a curved space for a general deformation along one spatial direction. For this class of geometries, it is shown that curvature induces an extra phase in the electron wave function, which can also be explored to produce interference devices of the Aharonov-Bohm type.