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(a) Excitation power dependence of PL spectra at under cw excitation. Inset shows integrated PL intensity as a function of excitation power. (b) Temperature-dependent PL spectra. PL energies for different temperatures are presented in the inset.
(a) Excitation power dependence of PL spectra at under pulsed laser excitation. Open circles show the decay times at different detection energies. (b) Time-resolved PL spectra.
(a) Time-integrated PL spectra. The dashed and solid curves indicate the PL intensity with circular polarizations the same as and opposite to the pump laser polarization, respectively. (b) Time evolution of spin-dependent PL in F region. (c) Time evolution of spin-dependent PL in L region. Insets show time evolutions of spin polarization.
Dependence of free exciton spin relaxation time on temperature. Dashed line shows the fitting by the least-squares method.
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