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Dominant phonon wave vectors and strain-induced splitting of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mn>2</mml:mn><mml:mi>D</mml:mi></mml:mrow></mml:math>Raman mode of graphene
The dominant phonon wave vectors ${\mathbit{q}}^{*}$ probed by the $2D$ Raman mode of pristine and uniaxially strained graphene are determined via a combination of ab initio calculations and a full two-dimensional integration of the transition matrix. We show that ${\mathbit{q}}^{*}$ are highly anisotropic and rotate about $\mathbit{K}$ with the polarizer …