Dominant Phonon Wavevectors and Strain-induced Splitting of the 2D Graphene Raman Mode

Details Dominant Phonon Wavevectors and Strain-induced Splitting of the 2D Graphene Raman Mode Dominant Phonon Wavevectors and Strain-induced Splitting of the 2D Graphene Raman Mode

2011-02-25

arxiv.org/abs/1102.5317v3

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 6 figures

Scientific paper

The dominant phonon wavevectors $q^{*}$ probed by the 2D Raman mode of graphene are highly anisotropic and rotate with the orientation of the polarizer:analyzer direction relative to the lattice. The corresponding electronic transitions connect the electronic equibandgap contours where the product of the ingoing and outgoing optical matrix elements is strongest, showing a finite component along $\bm{K}-\bm{\Gamma}$ that sensitively determines $q^{*}$. We revoke the notion of 'inner' and 'outer' processes. Our findings explain the splitting of the 2D mode of graphene under uniaxial tensile strain. The splitting originates from a strain-induced distortion of the phonon dispersion; changes in the electronic band structure and resonance conditions are negligeable for the 2D Raman spectrum.

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