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

2008/06/30 by Thomas Belhadj, T. Belhadj, Takashi Kuroda +10 · 3 citations
Physics and Astronomy · #Physics of Superconductivity and Magnetism #Quantum and electron transport phenomena #Semiconductor Quantum Structures and Devices #cond-mat.mes-hall #physics.optics

paper · pdf · doi:10.1103/physrevb.78.205325

published as Physical Review B 78, 205325 (2008) · 7 pages, 3 figures

arxiv created 2008/10/06 · openalex publication_date 2008/11/24 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We report on 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 4 K. 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 we present a direct measurement of the buildup time of the nuclear polarization in a single GaAs dot in the order of 1 s.

Citations

• Coherent Manipulation of Coupled Electron Spins in Semiconductor Quantum Dots

Cited by

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• Suppression of nuclear spin diffusion at aGaAs/AlxGa1−xAsinterface measured with a single quantum-dot nanoprobe
• Impact of heavy hole-light hole coupling on optical selection rules in GaAs quantum dots