Estudo da supercondutividade na bicamada de grafeno rotacionada e intercalada com carbono.

Abstract

Graphene is a carbon allotrope consisting of a sheet composed of carbon atoms in a two- dimensional hexagonal network, and with a thickness of only one atom. Two-layer

graphene is a purely two-dimensional material and consists of two stacked graphene monolayers. Since its discovery, this material has been the focus of investigation by several researchers, motivated by the material's excellent physical properties and its promising potential for applications. Among these various forms, we have the graphene bilayer rotated by an angle and intercalated with atoms, which was the object of study of this research. Initially, a supercell rotated by an angle of 21,8° was constructed. And using Density Functional Theory (DFT) inserted into the SIESTA computer codes. The electronic properties of the structure with carbon atom intercalation in three different positions, bridge, top and hollow, were calculated. The results pointed out higher stability in the bridge case, and in the density of states we observed a peak at the Fermi energy, and presence of flat bands in the band structure of the material at the Fermi level. Finally, according to the literature (CODECIDO et al., 2019) these characteristics indicate us a possibility that this system is a superconductor.