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.
Hopfield, Theory of the contribution of excitons to the com- plex dielectric constant of crystals, Physical Review112, 1555 (1958)
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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.