Circular photovoltaic effect in an anisotropic graphene superlattice in the presence of a constant electric field

Abstract

The unique electrical and optical properties of graphene-based materials and the development of techniques for fabricating low-dimensional structures motivate intensive efforts to implement graphene-based nano- and optoelectronics. However, the pseudo-relativistic behavior of charge carriers was found in the energy bands of not only graphene. There is a certain class of two-dimensional (2D) materials, which includes graphene, silicene, germanene, phosphoric, etc. It is called Dirac materials or graphene-like materials. Currently, the possibility of creating an electronic band structure of graphene by using an additional periodic potential has aroused increased research interest in superlattices (SLs) based on graphene-like materials (GSL). In this paper, the influence of a constant electric field on the circular photovoltaic effect in an anisotropic GSL at normal incidence are investigated. The expression for the current density in such a superlattice is obtained.