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Paper   IPM / Physic / 11374
School of Physics
  Title:   Compressibility of the Electron Gas in Bilayer Graphene
  Author(s): 
1.  Giovanni Borghi
2.  Marco Polini
3.  Reza Asgari
4.  A.H MacDonald
  Status:   Published
  Journal: Phys. Rev. B
  Vol.:  82
  Year:  2010
  Pages:   155403
  Supported by:  IPM
  Abstract:
Bilayer graphene is a recently isolated and intriguing class of many-body system with massive chiral quasiparticles. We present theoretical results for the electronic compressibility of bilayer graphene that are based on a four-band continuum band structure model combined with a ran- dom phase approximation treatment of electronic correlations. We find that the compressibility is strongly suppressed by electron-electron interactions at low carrier densities. Correlations do not lead to any qualitative new features, but are crucially important for a quantitative understanding of this fundamental thermodynamic property of graphene bilayers.

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