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Related Experiment Videos

Mesoscopic effects in adiabatic spin pumping.

Prashant Sharma1, Piet W Brouwer

  • 1Laboratory of Atomic and Solid State Physics, Cornell University, Ithaca, New York 14853-2501, USA.

Physical Review Letters
|November 13, 2003
PubMed
Summary
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Temporal modulations of quantum dots with spin-orbit coupling generate a spin current. The current’s polarization depends on spin-orbit coupling strength, ranging from perpendicular to mesoscopically fluctuating directions.

Area of Science:

  • Condensed Matter Physics
  • Quantum Optics
  • Materials Science

Background:

  • Quantum dots are semiconductor nanocrystals with tunable electronic properties.
  • Spin-orbit coupling influences electron behavior in materials, affecting spin polarization.
  • Temporal modulations, or pumping, can drive dynamic processes in quantum systems.

Purpose of the Study:

  • To investigate the generation of dc spin current via temporal shape modulations in quantum dots.
  • To analyze the influence of spin-orbit coupling strength on spin current polarization.
  • To study the statistical properties of spin and charge currents across a wide range of spin-orbit coupling.

Main Methods:

  • Theoretical analysis of quantum dot dynamics under temporal modulations.

Related Experiment Videos

  • Adiabatic limit calculations to study current generation.
  • Investigation of the crossover from weak to strong spin-orbit coupling regimes.

    • Main Results:

    • Temporal pumping of quantum dots with spin-orbit coupling induces a finite dc spin current.
    • Spin current polarization is perpendicular to the 2D electron gas plane for strong coupling, or exhibits mesoscopic fluctuations.
    • Detailed statistics of spin and charge currents are provided for the adiabatic regime.

    Conclusions:

    • Temporal modulations offer a mechanism for generating spin currents in quantum dots.
    • Spin-orbit coupling plays a crucial role in determining the polarization and behavior of these spin currents.
    • The findings provide insights into spin transport phenomena in mesoscopic systems.