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Wigner-molecularization-enabled dynamic nuclear polarization

Author

Listed:
  • Wonjin Jang

    (Seoul National University)

  • Jehyun Kim

    (Seoul National University)

  • Jaemin Park

    (Seoul National University)

  • Gyeonghun Kim

    (Seoul National University)

  • Min-Kyun Cho

    (Seoul National University)

  • Hyeongyu Jang

    (Seoul National University)

  • Sangwoo Sim

    (Seoul National University)

  • Byoungwoo Kang

    (Seoul National University)

  • Hwanchul Jung

    (Pusan National University)

  • Vladimir Umansky

    (Weizmann Institute of Science)

  • Dohun Kim

    (Seoul National University)

Abstract

Multielectron semiconductor quantum dots (QDs) provide a novel platform to study the Coulomb interaction-driven, spatially localized electron states of Wigner molecules (WMs). Although Wigner-molecularization has been confirmed by real-space imaging and coherent spectroscopy, the open system dynamics of the strongly correlated states with the environment are not yet well understood. Here, we demonstrate efficient control of spin transfer between an artificial three-electron WM and the nuclear environment in a GaAs double QD. A Landau–Zener sweep-based polarization sequence and low-lying anticrossings of spin multiplet states enabled by Wigner-molecularization are utilized. Combined with coherent control of spin states, we achieve control of magnitude, polarity, and site dependence of the nuclear field. We demonstrate that the same level of control cannot be achieved in the non-interacting regime. Thus, we confirm the spin structure of a WM, paving the way for active control of correlated electron states for application in mesoscopic environment engineering.

Suggested Citation

  • Wonjin Jang & Jehyun Kim & Jaemin Park & Gyeonghun Kim & Min-Kyun Cho & Hyeongyu Jang & Sangwoo Sim & Byoungwoo Kang & Hwanchul Jung & Vladimir Umansky & Dohun Kim, 2023. "Wigner-molecularization-enabled dynamic nuclear polarization," Nature Communications, Nature, vol. 14(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-38649-5
    DOI: 10.1038/s41467-023-38649-5
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