title: The effect of spin-orbit interaction on optical conductivity in graphene.
abstract: We present a systematic investigation of the effect of spin-orbit interaction on optical conductivity in monolayer graphene. Our key findings are: (i) level splitting at various crystal symmetry points caused by true spin as well as pseudospin of the electrons gives rise to a resonant current response; (ii) under heavy doping, the spin-orbit interaction leads to a re-entrance of finite conductivity at very low frequency which was strictly forbidden in the absence of spin-orbit coupling; (iii) deformation of band structure and the topological properties of trigonal warping are analytically identified in a low-energy conical-like approximation.
authors.affiliation: School of Physics, Peking University, Beijing, People's Republic of China.
authors.forename: Wei
authors.initials: W
authors.lastname: Wang
authors.forename: Chao
authors.initials: C
authors.lastname: Zhang
authors.forename: Zhongshui
authors.initials: Z
authors.lastname: Ma