Abstract: We propose new and promising technique for studying quantum- size structures. We tested this technique based on optical two-photon excitation and probing of renormalized electron spectrum in our investigation of monocrystalline PbTe films. We revealed sharp dependence of spectral position of two- photon resonances versus film thickness L $EQ 6, 18, and 30 nm. Our theoretical model explained this result by taking into account Pb Te band structure, electron-electron and electron-phonon interactions, and redistribution of charge carriers due to inter- and intraband processes. Estimation T$-2$/ $GREQ 300 fs for decay time of interband polarization was obtained.!26
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