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Exciton–Acoustic Phonon Coupling in Single CdTe Quantum Dots

✍ Scribed by L. Besombes; L. Marsal; K. Kheng; H. Mariette

Publisher
John Wiley and Sons
Year
2001
Tongue
English
Weight
115 KB
Volume
224
Category
Article
ISSN
0370-1972

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✦ Synopsis

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.

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