Holography of the Dirac Fluid in Graphene with two currents

TL;DR

This paper models the strongly coupled Dirac fluid in graphene using holography with two conserved currents, providing a better match to experimental transport data and suggesting the physical origin of these currents.

Contribution

It introduces a holographic two-current model that improves the understanding of transport phenomena in graphene's Dirac fluid compared to single-current models.

Findings

Enhanced agreement with experimental data on transport coefficients

Analytic expressions for conductivity and thermoelectric coefficients

Identification of two distinct conserved currents in graphene

Abstract

Recent experiments have uncovered evidence of the strongly coupled nature of the graphene: the Wiedemann-Franz law is violated by up to a factor of 20 near the charge neutral point. We describe this strongly-coupled plasma by a holographic model in which there are two distinct conserved U(1) currents. We find that our analytic results for the transport coefficients for two current model have a significantly improved match to the density dependence of the experimental data than the models with only one current. The additive structure in the transports coefficients plays an important role. We also suggest the origin of the two currents.