High harmonic spectroscopy retrieves electronic structure of high-pressure superconductors

https://phys.org/news/2024-02-high-harmonic-spectroscopy-electronic-pressure.html

"phonon-mediated all-optical probing band dispersion and many-body EPC... ultra-fast HHG high-pressure quantum states of electrons near Fermi level... near room temperature superconductivity (Tc > 200 K) in high-pressure hydrides H3S and LaH10... up-conversion of laser light to radiation carried at multiples of laser frequency... HHG in solids originates from nonlinear electrons driving within and between electronic bands by strong field light-matter interactions... nonlinear, non-perturbative laser-matter interaction"

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