Plasmon-mediated Coulomb drag between graphene waveguides

TL;DR

This paper provides a theoretical analysis of Coulomb drag in graphene waveguides, highlighting the role of plasmons at finite temperatures and the dependence of drag resistivity on separation distance.

Contribution

It introduces a novel design of graphene waveguides using antidot lattices and analyzes the plasmon-mediated Coulomb drag behavior.

Findings

Drag resistivity increases with temperature above 0.1T_F due to plasmons.

Drag resistivity scales approximately as d^{-6} with waveguide separation.

Complex behaviors occur at low temperatures in the weak coupling regime.

Abstract

We analyze theoretically charge transport in Coulomb coupled graphene waveguides (GWGs). The GWGs are defined using antidot lattices, and the lateral geometry bypasses many technological challenges of earlier designs. The drag resistivity $\rho_D$, which is a measure of the many-particle interactions between the GWGs, is computed for a range of temperatures and waveguide separations. It is demonstrated that for $T>0.1T_F$ the drag is significantly enhanced due to plasmons, and that in the low-temperature regime a complicated behavior may occur. In the weak coupling regime the dependence of drag on the interwaveguide separation $d$ follows $\rho_D \sim d^{-n}$, where $n \simeq 6$.