Screening effects of coulomb interactions of C3N compounds

In this paper we investigate the screening effects of coulomb interaction in monolayer and bilayer C3N and C3NH3 samples based on the random-phase approximation and compared with graphene and hydrogenated graphene. We calculate partially (U) and fully (W) screened, and also bare (V) interaction parameters for these compounds. In the system with more electrical conductivity the effects of the screening are greater and the parameters U and W are further reduced. In monolayer C3N, interaction parameters are similar to those of graphene. The fully hydrogenated C3N is also a relatively large gap in the chair-type and boat-type, and the values of interaction parameters are greater than the monolayer C3N and hydrogenated graphene values.  In the bilayer C3N with metallic behavior, there's a large screening that makes it a correlated system.