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Exciton–Acoustic Phonon Coupling in Single CdTe Quantum Dots
Author(s) -
Besombes L.,
Marsal L.,
Kheng K.,
Mariette H.
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/(sici)1521-3951(200104)224:3<621::aid-pssb621>3.0.co;2-0
Subject(s) - dephasing , exciton , photoluminescence , phonon , condensed matter physics , quantum dot , spectral line , spectroscopy , relaxation (psychology) , materials science , molecular physics , homogeneous broadening , coupling (piping) , doppler broadening , physics , quantum mechanics , optoelectronics , psychology , social psychology , metallurgy
The photoluminescence spectra of individual quantum dots have been measured with high spectral and spatial resolution spectroscopy. The temperature dependence of the line broadening is analyzed for different single‐confined excitons. At low temperatures, the photoluminescence spectra can be very well fitted by a Lorentzian, as expected from the lifetime broadening and the pure dephasing described by a linear phase damping. However, surprisingly, when increasing the temperature, the line shape progressively deviates from a Lorentzian and an additional broad background is observed. This non‐Lorentzian line shape and its temperature dependence are theoretically modeled on the basis of lattice relaxation due to the exciton–acoustic phonon coupling.