The intraband relaxation in quantum dot (QD) systems is impeded by the phonon bottleneck effect and the typical relaxation time (1-100ps) is much longer than that (0.1-1ps) in the quantum wells. Many factors, in addition to the temperature, may affect the relaxation rate, such as the availability of Auger-like relaxation channel. The bottleneck has only trivial influence if only the spontaneous recombination exists, since this process is much slower than the intraband relaxation. But in the case of stimulated emission, the influence may be significant.
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