Strain effect on the optical conductivity of graphene

By F. Pellegrino, G. Angilella, R. Pucci. 2009

167 citations recorded by the source corpus.

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 in 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.

Subfields: Atomic and Molecular Physics, and Optics, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/ced1172a3192f500fc0b430f317f497cdf1dba39

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In Atomic and Molecular Physics, and Optics

In Materials Chemistry

Citations in the corpus

Strain effects in graphene and graphene nanoribbons: The underlying mechanism (2010, methodology): “It was previously suggested using an analytical model that a realistic band gap will be opened under such a collision [43], and a similar effect has also been observed in TB and DFT calculations [26, 30, 31].”
Novel effects of strains in graphene and other two dimensional materials (2015, background): “It is worth emphasyzing that the Fermi velocity tensor, as well as the other terms obtained from the symmetry analysis, was computed by expanding the Hamiltonian around the high symmetry point K.”