Dynamical polarizability of graphene beyond the Dirac cone approximation

URN to cite this document:: urn:nbn:de:bvb:355-epub-243019
DOI to cite this document:: 10.5283/epub.24301

Stauber, Tobias ; Schliemann, John ; Peres, N. M. R.

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Date of publication of this fulltext: 11 May 2012 09:49

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Abstract

We compute the dynamical polarizability of graphene beyond the usual Dirac cone approximation, integrating over the full Brillouin zone. We find deviations at (h) over bar omega=2t (where t is the hopping parameter) which amount to a logarithmic singularity due to the Van Hove singularity and derive an approximate analytical expression. Also at low energies, we find deviations from the results ...