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

Abstract

The dominant phonon wavevectors $q^{\ast }$ 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 $\mathbf{K}-\mathbf{\Gamma }$ that sensitively determines $q^{\ast }$. 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.

4 pages, 6 figures

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• Theoretical polarization dependence of the two-phonon double-resonant Raman spectra of graphene
• Evolution of Raman G and G'(2D) Modes in Folded Graphene Layers
• Beyond double-resonant Raman scattering: UV Raman spectroscopy on graphene, graphite and carbon nanotubes
• Line Shape of the Raman 2D Peak of Graphene in Van Der Waals Heterostructures
• Theoretical 2D Raman band of strained graphene
• Effect of anisotropic band curvature on carrier multiplication in graphene
• Stress and charge transfer in uniaxially strained CVD graphene
• Uniaxial strain-induced Kohn anomaly and electron-phonon coupling in acoustic phonons of graphene
• Kohn anomaly of optical zone boundary phonons in uniaxial strained graphene: role of the electronic band structure
• Interference effects in polarization controlled Rayleigh scattering in twisted bilayer graphene
• Theory of Graphene Raman Spectroscopy