Charge distribution and screening in layered graphene systems

Details Charge distribution and screening in layered graphene systems Charge distribution and screening in layered graphene systems

2006-11-07

arxiv.org/abs/cond-mat/0611185v2

Phys. Rev. B 75 235433 (2007)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

8 pages

Scientific paper

10.1103/PhysRevB.75.235433

The charge distribution induced by external fields in finite stacks of graphene planes, or in semiinfinite graphite is considered. The interlayer electronic hybridization is described by a nearest neighbor hopping term, and the charge induced by the self consistent electrostatic potential is calculated within linear response (RPA). The screening properties are determined by contributions from inter- and intraband electronic transitions. In neutral systems, only interband transitions contribute to the charge polarizability, leading to insulating-like screening properties, and to oscillations in the induced charge, with a period equal to the interlayer spacing. In doped systems, we find a screening length equivalent to 2-3 graphene layers, superimposed to significant charge oscillations.

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