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Paper   IPM / P / 9521
School of Physics
  Title:   Fermi Velocity Enhancement in Monolayer and Bilayer Graphene
1.  G. Borghi
2.  M. Polini
3.  R. Asgari
4.  A.H. MacDonald
  Status:   Published
  Journal: Solid State Commun.
  Vol.:  149
  Year:  2009
  Pages:   1117-1122
  Supported by:  IPM
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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