Wigner-molecularization-enabled dynamic nuclear polarization

Wonjin Jang, Jehyun Kim, Jaemin Park, Gyeonghun Kim, Min-Kyun Cho, Hyeongyu Jang, Sangwoo Sim, Byoungwoo Kang, Hwanchul Jung, Vladimir Umansky and Dohun Kim ()
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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

Nature Communications, 2023, vol. 14, issue 1, 1-9

Abstract: 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.

Date: 2023
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DOI: 10.1038/s41467-023-38649-5

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