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Persistent spin current in a mesoscopic hybrid ring with spin-orbit coupling.

Qing-feng Sun1, X C Xie, Jian Wang

  • 1Beijing National Lab for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China.

Physical Review Letters
|August 7, 2007
PubMed
Summary
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Researchers demonstrate a persistent spin current in a mesoscopic ring with spin-orbit interaction. This spin Berry phase induces real spin motion, observable experimentally without charge current.

Area of Science:

  • Condensed matter physics
  • Mesoscopic physics
  • Spintronics

Background:

  • Mesoscopic rings exhibit persistent charge currents due to electron Berry phase.
  • Spin-orbit interaction introduces a spin Berry phase for traversing electrons.

Purpose of the Study:

  • Investigate equilibrium properties of mesoscopic rings with spin-orbit interaction.
  • Demonstrate the existence of a persistent spin current induced by the spin Berry phase.

Main Methods:

  • Theoretical calculation of persistent spin current.
  • Analysis of electron behavior in a hybrid mesoscopic ring.

Main Results:

  • Identified a persistent spin current independent of charge current in the normal region.

Related Experiment Videos

  • The calculated spin current represents actual spin motion.

    • Conclusions:

    • The spin Berry phase in mesoscopic rings with spin-orbit interaction induces a persistent spin current.
    • This persistent spin current is experimentally observable.