Fermi velocity renormalization and dynamical gap generation in graphene
High Energy Physics - Phenomenology
2015-01-13 v2 Strongly Correlated Electrons
Abstract
We study the renormalization of the Fermi velocity by the long-range Coulomb interactions between the charge carriers in the Dirac-cone approximation for the effective low-energy description of the electronic excitations in graphene at half filling. Solving the coupled system of Dyson-Schwinger equations for the dressing functions in the corresponding fermion propagator with various approximations for the particle-hole polarization we observe that Fermi velocity renormalization effects generally lead to a considerable increase of the critical coupling for dynamical gap generation and charge-density wave formation at the semimetal-insulator transition.
Keywords
Cite
@article{arxiv.1308.6199,
title = {Fermi velocity renormalization and dynamical gap generation in graphene},
author = {C. Popovici and C. S. Fischer and L. von Smekal},
journal= {arXiv preprint arXiv:1308.6199},
year = {2015}
}
Comments
10 pages, 4 figures, v2: corrections added, version published in PRB