Fermi velocity enhancement in monolayer and bilayer graphene |
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| Authors: | Giovanni Borghi Marco Polini Reza Asgari A.H. MacDonald |
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| Affiliation: | 1. Department of Chemistry, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Korea;2. EMMG, Physics Division, PINSTECH, P.O. Nilore, Islamabad, Pakistan |
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| 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. |
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