Nuclear magnetization in gallium arsenide quantum dots at zero magnetic field

Abstract

Optical and electrical control of the nuclear spin system allows enhancing the sensitivity of NMR applications and spin-based information storage and processing. Dynamic nuclear polarization in semiconductors is commonly achieved in the presence of a stabilizing external magnetic field. Here we report efficient optical pumping of nuclear spins at zero magnetic field in strain free GaAs quantum dots. The strong interaction of a single, optically injected electron spin with the nuclear spins acts as a stabilizing, effective magnetic field (Knight field) on the nuclei. We optically tune the Knight field amplitude and direction. In combination with a small transverse magnetic field, we are able to control the longitudinal and transverse component of the nuclear spin polarization in the absence of lattice strain i.e. nuclear quadrupole effects, as reproduced by our model calculations.

8 pages, 3 figures

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Cited by in corpus (22)

• Droplet Epitaxy of Semiconductor Nanostructures for Quantum Photonic Devices
• Highly entangled photons from hybrid piezoelectric-semiconductor quantum dot devices
• Size dependent line broadening in the emission spectra of single GaAs quantum dots: Impact of surface charges on spectral diffusion
• Interplay of Electron and Nuclear Spin Noise in GaAs
• Electrical initialization of electron and nuclear spins in a single quantum dot at zero magnetic field
• Electron and nuclear spin properties of the nanohole-filled GaAs/AlGaAs quantum dots
• Exciton Footprint of Self-assembled AlGaAs Quantum Dots in Core-Shell Nanowires
• Charge tuning in [111] grown GaAs droplet quantum dots
• Hyperfine coupling of hole and nuclear spins in symmetric GaAs quantum dots
• Nuclear spin diffusion in the central spin system of a GaAs/AlGaAs quantum dot
• Magneto-spectroscopy of excited states in charge-tunable GaAs/AlGaAs [111] quantum dots
• Narrowing of the Overhauser field distribution by feedback-enhanced dynamic nuclear polarization
• Investigation of in-plane nuclear field formation in single self-assembled quantum dots
• The nuclear polaron beyond the mean-field approximation
• Two-laser dynamic nuclear polarization with semiconductor electrons: feedback, suppressed fluctuations, and bistability near two-photon resonance
• High-efficiency optical pumping of nuclear polarization in a GaAs quantum well
• Vanishing fine structure splittings in telecom wavelength quantum dots grown on (111)A surfaces by droplet epitaxy
• Fast optical control of spin in semiconductor interfacial structures
• Electrically tunable dynamic nuclear spin polarization in GaAs quantum dots at zero magnetic field
• Hilbert Space Fragmentation and Subspace Scar Time-Crystallinity in Driven Homogeneous Central-Spin Models
• Intrinsic limit to electron spin coherence in InGaAs quantum dots featuring strain-induced nuclear dispersion
• Giant Hyperfine Interaction between a Dark Exciton Condensate and Nuclei