On Coulomb drag in double layer systems

Details On Coulomb drag in double layer systems On Coulomb drag in double layer systems

2012-03-30

arxiv.org/abs/1203.6777v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

We argue, for a wide class of systems including graphene, that in the low temperature, high density, large separation and strong screening limits the drag resistivity behaves as d^{-4}, where d is the separation between the two layers. The results are independent of the energy dispersion relation, the dependence on momentum of the transport time, and the wave function structure factors. We discuss how a correct treatment of the electron-electron interactions in an inhomogeneous dielectric background changes the theoretical analysis of the experimental drag results of Ref. [1]. We find that a quantitative understanding of the available experimental data [1] for drag in graphene is lacking.

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