Many-body renormalization of Landau levels in graphene due to screened Coulomb interaction

Many-body renormalization of the minimal conductivity in graphene.

The conductance of ballistic graphene at the neutrality point is due to coherent electron tunneling between the leads, the so called pseudodiffusive regime. The conductance scales as a function of the sample dimensions in the same way as in a diffusive metal, despite the difference in the physical mechanisms involved. The electron-electron interaction modifies this regime, and plays a role simi...

Many-body effects in graphene beyond the Dirac model with Coulomb interaction

Renormalization of the Velocity Anisotropy due to Coulomb Interaction in 3D Semimetals

We consider anisotropic (3+1)D semimetals with linear electronic spectrum. Our purpose is to investigate the influence of instantaneous Coulomb interaction on the anisotropy of the velocity. We consider both weak and strong coupling limits. To analyze the system, we construct renormalization group (RG) equations for the components of the velocity. We show that in the weak coupling limit Coulomb...

Coulomb drag in high Landau levels

I. V. Gornyi,1,* A. D. Mirlin,1,2,† and F. von Oppen3,4 1Institut für Nanotechnologie, Forschungszentrum Karlsruhe, D-76021 Karlsruhe, Germany 2Institut für Theorie der Kondensierten Materie, Universität Karlsruhe, D-76128 Karlsruhe, Germany 3Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot 76100, Israel 4Institut für Theoretische Physik, Freie Universität Berlin, ...

A New Type of Charge Screening Due to Phonon-coulomb Mixing in Many-body Physics

The calculation of the phonon-e lec t ron and electric charge screening is a standard procedure in manyparticle physics ,1. However, very little has been published on its exact form and its field theoretic definition from renormahzation techniques [2]. A consistent evaluation of charge screening, as it is done in this letter yields results which cannot be predicted by reasoning based on evidenc...