Nonlinear optical response in gapped graphene

Details Nonlinear optical response in gapped graphene Nonlinear optical response in gapped graphene

2012-02-06

arxiv.org/abs/1202.1070v1

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

We present a formulation for the nonlinear optical response in gapped graphene, where the low-energy single-particle spectrum is modeled by massive Dirac theory. As a representative example of the formulation presented here, we obtain closed form formula for the third harmonic generation (THG) in gapped graphene. It turns out that the covariant form of the low-energy theory gives rise to a peculiar logarithmic singularities in the nonlinear optical spectra. The universal functional dependence of the response function on dimension-less quantities indicates that the optical nonlinearity can be largely enhanced by tuning the gap to smaller values.

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