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Nuclear spin diffusion in the central spin system of a GaAs/AlGaAs quantum dot

Author

Listed:
  • Peter Millington-Hotze

    (University of Sheffield)

  • Santanu Manna

    (Johannes Kepler University Linz
    Indian Institute of Technology Delhi)

  • Saimon F. Covre da Silva

    (Johannes Kepler University Linz)

  • Armando Rastelli

    (Johannes Kepler University Linz)

  • Evgeny A. Chekhovich

    (University of Sheffield)

Abstract

The spin diffusion concept provides a classical description of a purely quantum-mechanical evolution in inhomogeneously polarized many-body systems such as nuclear spin lattices. The central spin of a localized electron alters nuclear spin diffusion in a way that is still poorly understood. Here, spin diffusion in a single GaAs/AlGaAs quantum dot is witnessed in the most direct manner from oscillatory spin relaxation dynamics. Electron spin is found to accelerate nuclear spin relaxation, from which we conclude that the long-discussed concept of a Knight-field-gradient diffusion barrier does not apply to GaAs epitaxial quantum dots. Our experiments distinguish between non-diffusion relaxation and spin diffusion, allowing us to conclude that diffusion is accelerated by the central electron spin. Such acceleration is observed up to unexpectedly high magnetic fields – we propose electron spin-flip fluctuations as an explanation. Diffusion-limited nuclear spin lifetimes range between 1 and 10 s, which is sufficiently long for quantum information storage and processing.

Suggested Citation

  • Peter Millington-Hotze & Santanu Manna & Saimon F. Covre da Silva & Armando Rastelli & Evgeny A. Chekhovich, 2023. "Nuclear spin diffusion in the central spin system of a GaAs/AlGaAs quantum dot," Nature Communications, Nature, vol. 14(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-38349-0
    DOI: 10.1038/s41467-023-38349-0
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    References listed on IDEAS

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    1. Liang Zhai & Matthias C. Löbl & Giang N. Nguyen & Julian Ritzmann & Alisa Javadi & Clemens Spinnler & Andreas D. Wieck & Arne Ludwig & Richard J. Warburton, 2020. "Low-noise GaAs quantum dots for quantum photonics," Nature Communications, Nature, vol. 11(1), pages 1-8, December.
    2. Miro Kroutvar & Yann Ducommun & Dominik Heiss & Max Bichler & Dieter Schuh & Gerhard Abstreiter & Jonathan J. Finley, 2004. "Optically programmable electron spin memory using semiconductor quantum dots," Nature, Nature, vol. 432(7013), pages 81-84, November.
    3. George Gillard & Edmund Clarke & Evgeny A. Chekhovich, 2022. "Harnessing many-body spin environment for long coherence storage and high-fidelity single-shot qubit readout," Nature Communications, Nature, vol. 13(1), pages 1-8, December.
    4. G. Sallen & S. Kunz & T. Amand & L. Bouet & T. Kuroda & T. Mano & D. Paget & O. Krebs & X. Marie & K. Sakoda & B. Urbaszek, 2014. "Nuclear magnetization in gallium arsenide quantum dots at zero magnetic field," Nature Communications, Nature, vol. 5(1), pages 1-7, May.
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    Cited by:

    1. Peter Millington-Hotze & Harry E. Dyte & Santanu Manna & Saimon F. Covre da Silva & Armando Rastelli & Evgeny A. Chekhovich, 2024. "Approaching a fully-polarized state of nuclear spins in a solid," Nature Communications, Nature, vol. 15(1), pages 1-7, December.

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