Optical conductivity of bilayer graphene with and without an asymmetry gap

Details Optical conductivity of bilayer graphene with and without an asymmetry gap Optical conductivity of bilayer graphene with and without an asymmetry gap

2008-01-11

arxiv.org/abs/0801.1836v2

Phys. Rev. B vol. 77, 155409 (2008)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

final accepted version for PRB, added discussion and typos fixed

Scientific paper

10.1103/PhysRevB.77.155409

When a bilayer of graphene is placed in a suitably configured field effect device, an asymmetry gap can be generated and the carrier concentration made different in each layer. This provides a tunable semiconducting gap, and the valence and the conductance band no longer meet at the two Dirac points of the graphene Brillouin zone. We calculate the optical conductivity of such a semiconductor with particular emphasis on the optical spectral weight redistribution brought about by changes in gap and chemical potential due to charging. We derive an algebraic formula for arbitrary value of the chemical potential for the case of the bilayer conductivity without a gap.

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