We study the dependence of the plasmon dispersion relation of graphene on applied uniaxial strain. Besides electron correlation at the random-phase approximation level, we also include local field effects specific for the honeycomb lattice. As a consequence of the two-band character of the electronic band structure, we find two distinct plasmon branches. We recover the square-root behavior of the low-energy branch, and find a nonmonotonic dependence of the strain-induced modification of its stiffness, as a function of the wave-vector orientation with respect to applied strain.

Dynamical polarization of graphene under strain

PELLEGRINO F. M. D.;ANGILELLA G. G. N.
;
PUCCI R
2010

Abstract

We study the dependence of the plasmon dispersion relation of graphene on applied uniaxial strain. Besides electron correlation at the random-phase approximation level, we also include local field effects specific for the honeycomb lattice. As a consequence of the two-band character of the electronic band structure, we find two distinct plasmon branches. We recover the square-root behavior of the low-energy branch, and find a nonmonotonic dependence of the strain-induced modification of its stiffness, as a function of the wave-vector orientation with respect to applied strain.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/20.500.11769/31971
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