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

Understand

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.