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Spin-current Seebeck effect in quantum dot systems.

Zhi-Cheng Yang1, Qing-Feng Sun, X C Xie

  • 1International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, People's Republic of China. Collaborative Innovation Center of Quantum Matter, Beijing, People's Republic of China.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|January 7, 2014
PubMed
Summary
This summary is machine-generated.

We investigated the spin-current Seebeck effect in quantum dot systems. Results show this effect can detect quantum dot polarization states, with significant enhancement possible via Coulomb interaction or magnetic fields.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Information Science

Background:

  • The spin-current Seebeck effect, a phenomenon converting heat gradients into spin currents, has been experimentally observed.
  • Quantum dots (QDs) are nanoscale semiconductor structures with tunable electronic properties.

Purpose of the Study:

  • To investigate the spin-current Seebeck effect in quantum dot systems.
  • To explore the potential of the spin-current Seebeck effect for detecting and monitoring QD polarization states.

Main Methods:

  • Theoretical investigation of the spin-current Seebeck effect in QD systems.
  • Analysis of the influence of intradot Coulomb interaction (U) and external magnetic fields on the spin-current Seebeck coefficient (S).

Main Results:

  • The spin-current Seebeck coefficient (S) is sensitive to QD polarization states, enabling their detection.
  • Intradot Coulomb interaction significantly enhances S, with a factor of 80 improvement demonstrated for U >> Γ.
  • A large S can also be achieved in QDs with negligible Coulomb interaction by applying an external magnetic field.

Conclusions:

  • The spin-current Seebeck effect is a promising tool for probing and controlling spin polarization in QDs.
  • Quantum dots offer a versatile platform for exploring and potentially harnessing the spin-current Seebeck effect.