Electron and nuclear spin properties of the nanohole-filled GaAs/AlGaAs quantum dots

Abstract

GaAs/AlGaAs quantum dots grown by in-situ droplet etching and nanohole infilling offer a combination of strong charge confinement, optical efficiency, and spatial symmetry required for polarization entanglement and spin-photon interface. Here we study spin properties of such dots. We find nearly vanishing electron $g$-factor ($g_e<0.05$), providing a route for electrically driven spin control schemes. Optical manipulation of the nuclear spin environment is demonstrated with nuclear spin polarization up to $60\%$ achieved. NMR spectroscopy reveals the structure of two types of quantum dots and yields the small magnitude of residual strain ${\epsilon }_b<0.02\%$ which nevertheless leads to long nuclear spin lifetimes exceeding 1000 s. The stability of the nuclear spin environment is advantageous for applications in quantum information processing.

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• Ideal refocusing of an optically active spin qubit under strong hyperfine interactions
• Measurement of the spin temperature of optically cooled nuclei and GaAs hyperfine constants in GaAs/AlGaAs quantum dots
• Single-Particle-Picture Breakdown in laterally weakly confining GaAs Quantum Dots
• On-demand semiconductor source of 780 nm single photons with controlled temporal wave packets
• Correlations between Optical Properties and Voronoi-Cell Area of Quantum Dots
• Highly uniform GaSb quantum dots with indirect-direct bandgap crossover at telecom range
• Cross-calibration of GaAs deformation potentials and gradient-elastic tensors using photoluminescence and nuclear magnetic resonance spectroscopy in GaAs/AlGaAs quantum dot structures
• Nuclear spin diffusion in the central spin system of a GaAs/AlGaAs quantum dot
• Direct measurement of hyperfine shifts and radiofrequency manipulation of the nuclear spins in individual CdTe/ZnTe quantum dots
• The nuclear polaron beyond the mean-field approximation
• Probing strain modulation in a gate-defined one dimensional electron system
• Quantum non-demolition measurement of an electron spin qubit through its low-energy many-body spin environment
• Electron ground state $g$ factor in embedded InGaAs quantum dots: An atomistic study
• Quantum repeaters based on individual electron spins and nuclear-spin-ensemble memories in quantum dots