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Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping
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Published on: June 3, 2015

Purely electric spin pumping in one dimension.

Yshai Avishai1, Doron Cohen, Naoto Nagaosa

  • 1Department of Physics, Ben-Gurion University, Beer-Sheva 84105, Israel.

Physical Review Letters
|September 28, 2010
PubMed
Summary

We theoretically demonstrate quantum spin pumping in a simple 1D wire without charge movement. Applying orthogonal electric fields creates local spin-orbit terms, enabling this unique observable effect in time-reversal symmetric systems.

Area of Science:

  • Condensed matter physics
  • Quantum mechanics
  • Materials science

Background:

  • Quantum spin pumping is a phenomenon where electron spins are moved without net charge transport.
  • One-dimensional systems offer unique platforms for studying quantum phenomena due to reduced dimensionality.
  • Spin-orbit interaction is crucial for many exotic quantum effects.

Purpose of the Study:

  • To theoretically investigate the possibility of quantum spin pumping in a one-dimensional system.
  • To explore if quantum spin pumping can occur without simultaneous charge pumping.
  • To identify a novel mechanism for generating observable spin-orbit effects in 1D.

Main Methods:

  • Theoretical modeling of a one-dimensional system (e.g., a metallic wire).

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  • Application of two slowly varying orthogonal gate electric fields on different sections.
  • Introduction of local spin-orbit (Rashba) terms.
  • Analysis of non-commuting unitary transformations.

    • Main Results:

    • Demonstration of quantum spin pumping without net charge transport.
    • Generation of local Rashba spin-orbit terms via applied electric fields.
    • Observation of non-commuting unitary transformations in different sections of the wire.
    • Confirmation of a unique spin-orbit observable effect.

    Conclusions:

    • Quantum spin pumping is achievable in simple 1D systems without charge movement.
    • Orthogonal electric fields can induce local spin-orbit interactions for spin pumping.
    • This provides a novel, time-reversal symmetric manifestation of spin-orbit effects in 1D systems.