In single-layer graphene sheets non-local interband exchange leads to a renormalized Fermi-surface effective mass which vanishes in the low carrier-density limit. We report on a comparative study of Fermi surface effective mass renormalization in single-layer and AB-stacked bilayer graphene. We explain why the mass does not approach zero in the bilayer case, although its value is still strongly suppressed.
@article{arxiv.0902.1230,
title = {Fermi Velocity Enhancement in Monolayer and Bilayer Graphene},
author = {Giovanni Borghi and Marco Polini and Reza Asgari and A. H. MacDonald},
journal= {arXiv preprint arXiv:0902.1230},
year = {2009}
}
Comments
8 pages, 5 figures, submitted to the proceedings of the ICTP Conference `Graphene Week 2008' (Trieste, Italy)