We present time-resolved photoluminescence measurements performed on an ensemble of InAs quantum dots
with density of 1011 dots/cm2 and ground state transition energies centered at 1.216 eV. The wavelength of the
100fs excitation pulse was tuned through the ground (excited) state transitions, resulting in resonant (optical
phonon assisted) photoluminescence (PL). The PL was detected with its polarization both parallel with and
perpendicular to the excitation polarization (along one of the crystal's cleave axes). The decay of the PL was
time-resolved with a streak camera in the interval 1.5 - 3ns to avoid scattered laser light. A strong polarization
dependence was observed. Considerable amount of the resonant fluorescence signal and even of the non-resonant
PL signatures remained linearly polarized on a nanosecond time scale. A phenomenological rate equation analysis
is made.
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