DFT study on electronic and optical properties of graphene under an external electric field

The paper investigates the electronic and optical properties of graphene, under external electric field ( E ext ) according to perpendicular direction, using density functional theory DFT ). Applying graphene sheet modifies its properties, including band gap energy, total states TDOS ), absorption coefficient, dielectric function, refractive index. Graphene’s is opened by application structure. As a result effect on layer, coefficient increases in ultraviolet UV range decreases visible range. We found that material, can be altered excitation applied