Valentin N. Popov, Philippe Lambin
We study the 2D Raman band of in-plane uniaxially strained graphene within a non-orthogonal tight-binding model. The phonon dispersion and Raman intensity are calculated within this model using a perturbative approach. We find that the 2D band splits into two or three subbands, depending on the strain direction. The derived evolution of the 2D subbands with the change of the strain magnitude, strain direction angle, and laser photon energy, for parallel and perpendicular light polarization, is discussed in detail. In particular, the strain rate and the dispersion rate of the 2D subbands show large variation for the accessible strains and the usual laser photon energies. The obtained Raman shift of the 2D subbands corresponds well to the available experimental Raman data and can be used for detecting and monitoring strain in graphene for nanoelectronics applications.
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http://arxiv.org/abs/1301.0799
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