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Thermal Activation and Phase Relaxation of Excitons in CdSe/ZnSSe Quantum Island Structures
Author(s) -
Wagner H.P.,
Tranitz H.P.,
Schuster R.,
Engelhardt R.,
Pohl U.W.,
Bimberg D.
Publication year - 2001
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(200103)224:1<195::aid-pssb195>3.0.co;2-g
Subject(s) - dephasing , biexciton , exciton , photoluminescence , delocalized electron , relaxation (psychology) , condensed matter physics , binding energy , blueshift , physics , chemistry , atomic physics , materials science , molecular physics , optoelectronics , quantum mechanics , psychology , social psychology
The thermal activation and dephasing of excitons in self‐organized CdSe/ZnSSe quantum islands grown by metalorganic vapour phase epitaxy is investigated using temperature dependent photoluminescence (PL) and spectrally resolved four‐wave mixing (FWM). At low temperatures a multi‐exponential decay of the photon echo is observed indicating the presence of exciton states with different localization at comparable transition energies. With rising temperature the localized excitons are activated into more delocalized states leading to a blueshift of the PL maximum and an increasingly mono‐exponential decay of the FWM signal. From the biexciton‐induced transition a biexciton binding energy of 11.5 meV is determined.