Coulomb Drag in Systems with Tunneling Bridges

TL;DR

This paper investigates Coulomb drag in double-layer systems with tunneling links, revealing a negative, temperature-independent exchange contribution and a unique low-temperature behavior due to electron interactions.

Contribution

It introduces the effect of tunneling bridges on Coulomb drag, highlighting a significant exchange contribution and distinctive temperature dependence not previously characterized.

Findings

Negative exchange contribution to transconductance at zero temperature

Distinct singular temperature dependence of transconductance at low temperatures

Tunneling links significantly alter Coulomb drag behavior

Abstract

We study the Coulomb drag effect in double layer electronic systems with local tunneling links. The possibility of tunneling between the layers leads to a pronounced exchange contribution to the transconductance, which is negative and non-vanishing at zero temperature. The diffusive motion of the electrons inside each layer in interplay with the electron-electron interaction cause a distinguishable singular temperature dependence of the transconductance at low temperatures.