A perturbative derivation shows that X-ray-optical nonlinear signals in crystals carry a band-structure contribution, the joint density of states, separable from atomic-scale Wannier function contributions by polarization.
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Theory of nonlinear interactions between x rays and optical radiation in crystals
A perturbative derivation shows that X-ray-optical nonlinear signals in crystals carry a band-structure contribution, the joint density of states, separable from atomic-scale Wannier function contributions by polarization.