Anisotropic optical conductivity and electron-hole asymmetry in doped monolayer graphene in the presence of the Rashba coupling

作者：Sadeghi S S; Phirouznia A^*; Fallahi V

来源：Physica E: Low-Dimensional Systems and Nanostructures , 2015, 70: 28-34.

DOI：10.1016/j.physe.2015.01.032

• Graphene
• Rashba coupling
• Optical conductivity
• Electron-hole asymmetry
• CPA

In this study, the optical conductivity of substitutionary doped graphene is investigated in the presence of the Rashba spin orbit coupling (RSOC). Calculations have been performed within the coherent potential approximation (CPA) beyond the Dirac cone approximation. Results of the current study demonstrate that the optical conductivity is increased by increasing the RSOC strength. Meanwhile it was observed that the anisotropy of the band energy results in a considerable anisotropic optical conductivity (AOC) in monolayer graphene. The sign and magnitude of this anisotropic conductivity was shown to be controlled by the external field frequency. It was also shown that the Rashba interaction results in electron-hole asymmetry in monolayer graphene.

• 出版日期2015-6