Fermi Velocity Enhancement in Monolayer and Bilayer Graphene
arXiv:0902.1230 · doi:10.1016/j.ssc.2009.02.053
Abstract
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.
arXiv comment8 pages, 5 figures, submitted to the proceedings of the ICTP Conference `Graphene Week 2008' (Trieste, Italy)
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