Coulomb screening and collective excitations in biased bilayer graphene

Details Coulomb screening and collective excitations in biased bilayer graphene Coulomb screening and collective excitations in biased bilayer graphene

2010-01-15

arxiv.org/abs/1001.2762v1

Phys. Rev. B 81, 081402(R) (2010).

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures

Scientific paper

10.1103/PhysRevB.81.081402

We have investigated the Coulomb screening properties and plasmon spectrum in a bilayer graphene under a perpendicular electric bias. The bias voltage applied between the two graphene layers opens a gap in the single particle energy spectrum and modifies the many-body correlations and collective excitations. The energy gap can soften the plasmon modes and lead to a crossover of the plasmons from a Landau damped mode to being undamped. Plasmon modes of long lifetime may be observable in experiments and may have potentials for device applications.

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