A Green-function framework derives Floquet polariton spectra in pumped quantum materials from their nonlinear optical susceptibilities, predicting flat bands, exceptional points, and parametric instability in graphene, hBN, and layered superconductors.
Huang, Lattice vibrations and optical waves in ionic crys- tals, Nature167, 779 (1951)
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Floquet polaritons in optically driven materials
A Green-function framework derives Floquet polariton spectra in pumped quantum materials from their nonlinear optical susceptibilities, predicting flat bands, exceptional points, and parametric instability in graphene, hBN, and layered superconductors.