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(a) Pump and probe pulse spectra. (b) SHB signals for (upper trace) and -polarized (lower trace) probe pulses. The polarization of the pump is in both cases . Inset: Energy level diagram of a QD. The polarization selection rules for optical transitions and the spin relaxation are indicated by solid and dashed lines, respectively. Relaxation between two states and occurs at a rate , where denotes the exciton population decay rate, denotes the decay rate of the biexciton population, and is the relaxation between polarization states due to spin relaxation.
SHB spectra recorded at . Inset: Temperature dependence of the linewidth. The filled symbols indicate the experimental linewidth after deconvolution of the pump pulse from the raw data (open symbols). The solid line shows the fitting of assuming acoustic phonon broadening.
(a) Temporal evolution of the spectral antihole for (open symbols) and -polarized (filled symbols) probe pulses at . Inset: Decay of the spin polarization (symbols). A fit to the experimental data (line) yields . (b) Temperature dependence of the spin relaxation time.
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