  The electromagnetic coupling between hetero-structures made of different
materials is of great interest, both from the perspective of discovering new
phenomena, as well as for its potential applications in novel devices. In this
work, we study the electromagnetic coupling of a hetero-structure made of a
topological insulator (TI) slab and a single graphene layer, where the later
presents a diluted concentration of ionized impurities. We explore the
topological effects of the magneto-electric polarizability (MEP) of the TI, as
well as its relative dielectric permittivity on the electrical conductivity in
graphene at low but finite temperatures.
