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Photoluminescence spectra of ferroelectric sodium nitrite (NaNO2) polycrystals have been measured in the exciton transition region at room temperature and 77 K. The photoluminescence spectra have been shown to contain multiphonon replicas in a broad spectral range: from 390 to 550 nm. Conditions for lasing in sodium nitrite crystals are discussed.
Starting from the total Hamiltonian of an excited exciton–biexciton system, nonresonant renormalizations in the electronic spectrum of a coherently driven direct semiconductor are considered. Stringent group-theoretical inclusion of the particle spin in the Hamiltonian allows one to account for the dependence of different renormalization effects on polarizations of the incident laser fields. On the...
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