Nonperturbative Floquet-Keldysh theory for SHG in two-band systems predicts a shift from E squared to linear E scaling then to field-independent response, controlled by one- and two-photon resonances, and verified numerically in a GeS model.
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Nonperturbative effects in second harmonic generation
Nonperturbative Floquet-Keldysh theory for SHG in two-band systems predicts a shift from E squared to linear E scaling then to field-independent response, controlled by one- and two-photon resonances, and verified numerically in a GeS model.