Abstract
We study, in single quantum dot (QD) luminescence, the temperature-dependentbroadening mechanism due to the coupling between localized excitons and acousticphonons as well as the environment surrounding the QD system. As a treatment of theinteraction between the QD system and the environment, a configuration of excitoniceigenenergies is introduced. Using the Green’s function method, analytical formulae of thelineshape of zero-phonon lines (ZPL) are given. The numerical results show that phononsinducing initial fast decay contributes to the background wings of the spectra leading to awings-asymmetry photoluminescence (PL) spectra. Our model gives a semiquantitativedescription of the underlying broadening mechanism and is helpful in understanding theorigin of the experimental results for the temperature dependence of the ZPL inself-assembled QDs.
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