Coulomb drag between two strange metals

TL;DR

This paper investigates Coulomb drag between two strange-metal layers using holographic models, revealing a T^4 temperature dependence and potential experimental implications for cuprates.

Contribution

It introduces a holographic approach to study Coulomb drag in strange metals and predicts a distinct T^4 dependence at low temperatures.

Findings

Drag resistivity scales as T^4 at low temperatures

Numerical estimates suggest measurable effects at room temperature

Plasmons enhance the Coulomb drag in the system

Abstract

We study the Coulomb drag between two strange-metal layers using the Einstein-Maxwell-Dilaton model from holography. We show that the low-temperature dependence of the drag resistivity is $\rho_D \propto T^4$, which strongly deviates from the quadratic dependence of Fermi liquids. We also present numerical results at room temperature, using typical parameters of the cuprates, to provide an estimate of the magnitude of this effect for future experiments. We find that the drag resistivity is enhanced by the plasmons characteristic of the two-layer system.