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Exciton Dephasing, Polariton Propagation and Quantum Beats in CdS 1—x Se x
Author(s) -
Dinger A.,
Ell R.,
Reznitsky A.,
Klochikhin A.,
Klingshirn C.
Publication year - 2000
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 - 10.1002/1521-3951(200009)221:1<485::aid-pssb485>3.0.co;2-6
Subject(s) - dephasing , polariton , quantum beats , condensed matter physics , wave packet , mixing (physics) , four wave mixing , physics , photon , exciton , atomic physics , excited state , optics , nonlinear optics , quantum mechanics , laser
The exciton dephasing at low temperature in CdS 1— x Se x is investigated in the composition range from x = 0.07 to 0.8. Trends of fast and slowly decaying components in four wave mixing are revealed depending on the composition x . A plane‐parallel platelet, which exhibits strong Fabry‐Perot modes, shows a periodic, photon energy dependent modulation of the four wave mixing signal as a function of the delay between the incident pulses, which can be attributed to propagation effects of polariton wave packets or to beating between adjacent Fabry‐Perot modes. Another sample shows quantum beats with unusual properties, the origin of which will be discussed.