Dynamical response functions and collective modes of bilayer graphene

Details Dynamical response functions and collective modes of bilayer graphene Dynamical response functions and collective modes of bilayer graphene

2009-05-18

arxiv.org/abs/0905.2883v1

Phys. Rev. B 80, 241402(R) (2009)

Physics

Condensed Matter

Strongly Correlated Electrons

4 + epsilon pages, 4 figures, submitted

Scientific paper

10.1103/PhysRevB.80.241402

Bilayer graphene (BLG) has recently attracted a great deal of attention because of its electrically tunable energy gaps and its unusual electronic structure. In this Letter we present analytical and semi-analytical expressions, based on the four-band continuum model, for the layer-sum and layer-difference density response functions of neutral and doped BLG. These results demonstrate that BLG density-fluctuations can exhibit either single-component massive-chiral character or standard two-layer character, depending on energy and doping.

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