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| Paper IPM / P / 9521 |
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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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