Optically monitored nuclear spin dynamics in individual GaAs quantum dots grown by droplet epitaxy

Abstract

We report optical orientation experiments in individual, strain free GaAs quantum dots in AlGaAs grown by droplet epitaxy. Circularly polarized optical excitation yields strong circular polarization of the resulting photoluminescence at 4K. Optical injection of spin polarized electrons into a dot gives rise to dynamical nuclear polarization that considerably changes the exciton Zeeman splitting (Overhauser shift). We show that the created nuclear polarization is bistable and present a direct measurement of the build-up time of the nuclear polarization in a single GaAs dot in the order of one second.

7 pages, 3 figures

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Cited by in corpus (17)

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• Size dependent line broadening in the emission spectra of single GaAs quantum dots: Impact of surface charges on spectral diffusion
• Dark-bright mixing of interband transitions in symmetric semiconductor quantum dots
• Nuclear magnetization in gallium arsenide quantum dots at zero magnetic field
• Suppression of nuclear spin diffusion at a GaAs/AlGaAs interface measured with a single quantum dot nano-probe
• Magnetic field induced valence band mixing in [111] grown semiconductor quantum dots
• Electron and nuclear spin properties of the nanohole-filled GaAs/AlGaAs quantum dots
• Dynamics of Overhauser Field under nuclear spin diffusion in a quantum dot
• Hyperfine coupling of hole and nuclear spins in symmetric GaAs quantum dots
• Direct measurement of hyperfine shifts and radiofrequency manipulation of the nuclear spins in individual CdTe/ZnTe quantum dots
• Spin dynamics of quadrupole nuclei in InGaAs quantum dots
• Third Stable Branch and Tristability of Nuclear Spin Polarization in Single Quantum Dot System
• Electrically tunable dynamic nuclear spin polarization in GaAs quantum dots at zero magnetic field
• P-shell carriers assisted dynamic nuclear spin polarization in single quantum dots at zero external magnetic field