25 February 2010 Polarization conservation and dephasing in InAs quantum dot ensembles
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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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Alexej Chernikov, Swantje Horst, Stephan W. Koch, Sangam Chatterjee, Wolfgang W. Rühle, Julian Sweet, Benjamin C. Richards, Joshua Hendrickson, Galina Khitrova, Hyatt M. Gibbs, Dimitri Litvinov, Dagmar Gerthsen, Martin Wegener, "Polarization conservation and dephasing in InAs quantum dot ensembles", Proc. SPIE 7597, Physics and Simulation of Optoelectronic Devices XVIII, 75971R (25 February 2010); doi: 10.1117/12.841589; https://doi.org/10.1117/12.841589

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