Thermopower of multilayer graphene

Details Thermopower of multilayer graphene Thermopower of multilayer graphene

2010-08-22

arxiv.org/abs/1008.3687v3

Phys. Rev. B 82, 245415(2010)

Physics

Condensed Matter

Materials Science

11 pages, 10 figures; An inconsistency between the definitions of Eqs. (10) and (11) is found and corrected

Scientific paper

We systematically calculate thermopower of biased and unbiased multilayer grphene systems. The effect of screening to a bias field perpendicular to the graphene planes is taken into account self-consistently under the Hartree approximation. The model including nearest neighbor hopping and the more complete Slonczewski-Weiss-McClure (SWMcC) model are both considered for a comparison. The effect of impurity scattering is studied for monolayer and unbiased bilayer graphene and is treated in terms of the self-consistent Born approximation. For a monolayer graphene, only when the effect of impurity scattering is taken into account, could all the qualitative aspects of the experimental results be correctly reproduced. A small energy gap opens for the biased trilayer graphene. When the carrier density is high enough, a gap is also found for unbiased trilayer and quad-layer graphene. The biased bilayer graphene shows the largest thermopower among all the systems studied.

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