Stauber, Tobias and Schliemann, John and Peres, N. M. R.
Dynamical polarizability of graphene beyond the Dirac cone approximation.
Phys. Rev. B 81, 085409.
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Other URL: http://link.aps.org/doi/10.1103/PhysRevB.81.085409
We compute the dynamical polarizability of graphene beyond the usual Dirac cone approximation, integrating over the full Brillouin zone. We find deviations at ℏω=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 obtained from the ...
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