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Related Experiment Videos

Spin Hall current driven by quantum interferences in mesoscopic Rashba rings.

Satofumi Souma1, Branislav K Nikolić

  • 1Department of Physics and Astronomy, University of Delaware, Newark, Delaware 19716-2570, USA.

Physical Review Letters
|March 24, 2005
PubMed
Summary

We demonstrate an all-electrical nanostructure that generates pure spin current in a quantum ring. This spin current, driven by charge current injection, exhibits tunable oscillations due to quantum interference effects.

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Area of Science:

  • Condensed matter physics
  • Spintronics
  • Quantum phenomena

Background:

  • Spin current generation is crucial for spintronics.
  • Quantum interference effects in nanostructures offer unique spin manipulation possibilities.

Purpose of the Study:

  • To propose and theoretically investigate an all-electrical nanostructure for generating pure spin current.
  • To explore the role of Rashba spin-orbit coupling and quantum interference in spin current generation within a quantum ring.

Main Methods:

  • Theoretical modeling of a quantum-coherent ballistic one-dimensional ring.
  • Analysis of spin-sensitive quantum interference effects arising from the Aharonov-Casher phase.
  • Investigation of spin-Hall current generation via electrical charge current injection.

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Main Results:

  • Pure spin current is induced in transverse voltage probes attached to the quantum ring.
  • Quasiperiodic oscillations of the spin-Hall current are generated by tuning the Rashba spin-orbit coupling.
  • The generated spin-Hall current amplitude is comparable to that in 2D electron gases.

Conclusions:

  • The proposed nanostructure provides an efficient all-electrical method for pure spin current generation.
  • Quantum interference and spin-orbit coupling are key mechanisms for controlling spin currents in such systems.
  • The spin current is sensitive to the ring geometry and the presence of disorder.