Drag resistance of 2D electronic microemulsions

TL;DR

This paper develops a theoretical model explaining the unusually large drag resistance observed in low-density 2D electronic microemulsions, highlighting its unique temperature and magnetic field dependencies and persistence at zero temperature.

Contribution

It introduces a novel theory linking drag resistance in 2D microemulsions to the Pomeranchuk effect, explaining experimental anomalies.

Findings

Drag resistance is anomalously large in low-density 2D systems.

Drag does not vanish at zero temperature.

Temperature and magnetic field dependencies are linked to the Pomeranchuk effect.

Abstract

Motivated by recent experiments of Pillarisetty {\it et al}, \prl {\bf 90}, 226801 (2003), we present a theory of drag in electronic double layers at low electron concentration. We show that the drag effect in such systems is anomolously large, it has unusual temperature and magnetic field dependences accociated with the Pomeranchuk effect, and does not vanish at zero temperature.