Coulomb drag in double layer electron systems at even denominator filling factors

TL;DR

This paper investigates Coulomb drag in double layer electron systems at half filling factors under strong magnetic fields, revealing a unique temperature dependence of the momentum transfer rate due to residual gauge interactions.

Contribution

It introduces a mapping to composite fermions to analyze Coulomb drag, uncovering a non-standard $T^{4/3}$ temperature dependence caused by residual gauge interactions.

Findings

Momentum transfer rate scales as $T^{4/3}$ at low temperatures.

Residual gauge interactions significantly enhance Coulomb drag.

Mapping to composite fermions provides new insights into quantum Hall systems.

Abstract

An interacting double layer system, with uniform positive background, is studied at finite temperature in the presense of a strong magnetic field corresponding to half filling in each layer. By mapping this system to composite fermions in zero field, we investigate the momentum transfer rate between the layers. As a result of the residual gauge interactions, it turns out that the low temperature dependence of this rate is $T^{4/3}$ which is enhanced as compared to the normal $T^2$ behavior.