Strain effect on the optical conductivity of graphene

Details Strain effect on the optical conductivity of graphene Strain effect on the optical conductivity of graphene

2009-12-18

arxiv.org/abs/0912.3614v1

Phys. Rev. B 81 (2010) 035411

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Phys. Rev. B, to appear

Scientific paper

10.1103/PhysRevB.81.035411

Within the tight binding approximation, we study the dependence of the electronic band structure and of the optical conductivity 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 recover a linear behavior of the low-energy density of states, as long as the cone approximation holds, while a band gap opens for sufficiently intense strain, for almost all, generic strain directions. This may be interpreted in terms of an electronic topological transition, corresponding to a change of topology of the Fermi line, and to the merging of two inequivalent Dirac points as a function of strain. We propose that these features may be observed in the frequency dependence of the longitudinal optical conductivity in the visible range, as a function of strain modulus and direction, as well as of field orientation.

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