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Wigner-molecularization-enabled dynamic nuclear polarization.

Wonjin Jang1, Jehyun Kim1, Jaemin Park1

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|May 23, 2023
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Researchers controlled spin transfer between a three-electron Wigner molecule (WM) and its nuclear environment in a quantum dot. This demonstrates active control of correlated electron states, crucial for mesoscopic engineering applications.

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Area of Science:

  • Quantum physics
  • Condensed matter physics
  • Semiconductor quantum dots

Background:

  • Multielectron semiconductor quantum dots (QDs) are platforms for studying Wigner molecules (WMs).
  • The dynamics of Wigner molecules interacting with their environment are not well understood.
  • Controlling spin transfer in these systems is key for quantum technologies.

Purpose of the Study:

  • To demonstrate efficient control of spin transfer between a three-electron WM and the nuclear environment.
  • To investigate the role of Wigner-molecularization in controlling spin states.
  • To explore applications in mesoscopic environment engineering.

Main Methods:

  • Utilizing a Landau-Zener sweep-based polarization sequence.
  • Leveraging low-lying anticrossings of spin multiplet states enabled by Wigner-molecularization.
  • Employing coherent control of spin states in a GaAs double quantum dot.

Main Results:

  • Achieved efficient control over the magnitude, polarity, and site dependence of the nuclear field.
  • Demonstrated that this level of control is unique to the interacting Wigner molecule regime.
  • Confirmed the spin structure of the Wigner molecule.

Conclusions:

  • The study confirms the spin structure of Wigner molecules.
  • Efficient control of spin transfer between WMs and their environment is achievable.
  • This work paves the way for active control of correlated electron states for mesoscopic engineering.