Motivated by very recent studies of Coulomb drag in grahene-BN-graphene system we develop a theory of Coulomb drag for the Fermi liquid regime, for the case when the ratio of spacer thickness $d$ to the Fermi wavelength of electrons is arbitrary. The concentration ($n$) and thickness dependence of the drag resistivity is changed from $n^{ -3}d^{ -4}$ for the thick spacer to $n^{ -1}|\ln{ (nd^2)}|$ for the thin one.
Categories: cond-mat.mes-hall cond-mat.mtrl-sci