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. We also take into account the full three-dimensional representation for the wave functions of single-particle excitations. This induces quantitative changes in the plasmon dispersion relation.

Strain effect on the electronic spectrum of graphene: beyond two-dimensionality

Pellegrino F. M. D.;Angilella G. G. N.
;
Pucci R.
2016-01-01

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. We also take into account the full three-dimensional representation for the wave functions of single-particle excitations. This induces quantitative changes in the plasmon dispersion relation.
2016
9781466591318
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11769/59953
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