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Polarization Spectroscopy of Charged Single Self-Assembled Quantum Dots

  • Morgan E. Ware (a1), Allan Bracker (a1), Daniel Gammon (a1) and David Gershoni (a1)

Abstract

We have demonstrated single dot spectroscopy of InAs/GaAs self-assembled quantum dots embedded in a bias controlled Schottky diode. The photoluminescence spectra exhibit discrete lines depending on bias, which we attribute to the recombination of positively charged, neutral, and negatively charged confined excitons. With excitation directly into the dot, large circular polarization memory is exhibited by the two charged exciton (trion) lines. This indicates long spin lifetimes for both the electron and the heavy hole in the quantum dots.

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Polarization Spectroscopy of Charged Single Self-Assembled Quantum Dots

  • Morgan E. Ware (a1), Allan Bracker (a1), Daniel Gammon (a1) and David Gershoni (a1)

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