Probing of valley polarization in graphene via optical second-harmonic generation
arXiv:1407.6808 · doi:10.1103/PhysRevB.91.041404
Abstract
Valley polarization in graphene breaks inversion symmetry and therefore leads to second-harmonic generation. We present a complete theory of this effect within a single-particle approximation. It is shown that this may be a sensitive tool to measure the valley polarization created, e.g., by polarized light and, thus, can be used for a development of ultrafast valleytronics in graphene.
arXiv comment5 pages, 3 figures
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