Optically monitored nuclear spin dynamics in individual GaAs quantum dots grown by droplet epitaxy
| Autor: | Thomas Belhadj, Takaaki Mano, Xavier Marie, Thierry Amand, Bernhard Urbaszek, Nobuyuki Koguchi, Claire-Marie Simon, Kazuaki Sakoda, Takashi Kuroda |
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| Rok vydání: | 2008 |
| Předmět: |
Physics
Zeeman effect Polarization rotator Photoluminescence Condensed Matter - Mesoscale and Nanoscale Physics Condensed matter physics Spin polarization FOS: Physical sciences Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Condensed Matter Physics Polarization (waves) Molecular physics Electronic Optical and Magnetic Materials Condensed Matter::Materials Science symbols.namesake Quantum dot Mesoscale and Nanoscale Physics (cond-mat.mes-hall) symbols Insensitive nuclei enhanced by polarization transfer Circular polarization Physics - Optics Optics (physics.optics) |
| Zdroj: | Physical Review B. 78 |
| ISSN: | 1550-235X 1098-0121 |
| Popis: | 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. Comment: 7 pages, 3 figures |
| Databáze: | OpenAIRE |
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