Current induced and interaction driven Dirac-point drag of massless quasi-relativistic fermions

TL;DR

This paper investigates how electron-electron interactions induce a current-driven distortion of the Dirac point in two-dimensional massless Dirac fermions, revealing a novel interaction-driven drag effect potentially observable in graphene.

Contribution

It introduces the concept of a current-induced Dirac point drag caused by electron-electron interactions in massless Dirac fermions, highlighting the role of many-body effects without Galilean invariance.

Findings

Current induces pseudospin texture distortion in momentum space.

Electron-electron interactions cause a Dirac point drag.

Potential experimental observation in graphene.

Abstract

We study the quasiparticle properties of two-dimensional massless Dirac Fermions when the many-body states possess a finite momentum density in the clean limit. The lack of Galilean invariance endows the many-body states at finite momentum density with qualitative differences from those of the system at rest. At finite carrier densities we demonstrate the appearance of a current-induced distortion of the pseudospin texture in momentum space that can be viewed as a drag of the Dirac point and the origin of which lies entirely in electron-electron interactions. We discuss the potential observation of this effect in graphene.