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Exciton Polaritons in HgI 2 Crystals
Author(s) -
Akopyan I.,
Novikov B.,
Permogorov S.,
Selkin A.,
Travnikov V.
Publication year - 1975
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2220700137
Subject(s) - exciton , polariton , oscillator strength , resonance (particle physics) , spectral line , reflection (computer programming) , emission spectrum , biexciton , atomic physics , photoluminescence , semiconductor , condensed matter physics , exciton polaritons , physics , molecular physics , optics , optoelectronics , computer science , programming language , astronomy
At low temperatures a detailed study of the emission and reflection spectra of HgI 2 crystals in the region of the ground state n = 1(Γ 6 + −Γ 7 − ) exciton resonance has been carried out. It is found that the shape of the resonant exciton emission spectra in allowed and forbidden polarizations E ⊥ c and E ‖, and the relative positions of the emission and reflection spectra are similar to that in many direct gap semiconductors with the high oscillator strength of n = 1 exciton transition. The emission and reflection spectra of the HgI 2 crystals are correlated with the energy structure of the exciton resonance using the polariton model. The interrelation between the resonant exciton emission and the exciton absorption is discussed. The polariton dispersion curves in the region of the n =1 exciton resonance in HgI 2 crystals are calculated on the basis of experimental data.