Date: 07 Mar 2012

Strain Effect on the Electronic and Plasmonic Spectra of Graphene

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Within the tight binding approximation, we study the dependence of the electronic band structure and of the plasmonic spectrum of a graphene single layer on the modulus and direction of applied uniaxial strain. While the Dirac cone approximation, albeit with a deformed cone, is robust for sufficiently small strain, band dispersion linearity breaks down along a given direction, corresponding to the development of anisotropic massive low-energy excitations. We evaluate of the dynamical polarization and recover the plasmonic spectrum, within the random phase approximation (RPA). We explicitly consider local field effects (LFE). Thus, we are able to account for plasmons of any wavelength as a function of strain.