Coulomb drag in graphene

TL;DR

This paper provides a theoretical calculation of Coulomb drag resistivity in double-layer graphene, revealing its dependence on temperature, density, and layer separation in different regimes.

Contribution

It introduces a detailed theoretical analysis of Coulomb drag in graphene, highlighting asymptotic behaviors in high- and low-density limits.

Findings

Drag resistivity scales as T^2/n^3 at high density

Drag resistivity scales as T^2 ln(n)/n at low density

Provides analytical expressions for different regimes

Abstract

We calculate theoretically the Coulomb drag resistivity for two graphene monolayers spatially separated by a distance "$d$". We show that the frictional drag induced by inter-layer electron-electron interaction goes asymptotically as $T^2/n^3$ and $T^2 \ln(n)/n$ in the high-density ($k_F d \gg 1$) and low-density ($k_F d \ll 1$) limits, respectively.