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Spin accumulation on a one-dimensional mesoscopic Rashba ring.

Zhi-Yong Zhang1

  • 1Department of Physics, Nanjing University, Nanjing 210093, People's Republic of China.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|June 22, 2011
PubMed
Summary
This summary is machine-generated.

This study reveals a beating pattern in nonequilibrium spin accumulation on a 1D Rashba ring due to spin-orbit coupling. This pattern influences voltage-dependent spin accumulation, creating plateaus and oscillations.

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Area of Science:

  • Condensed matter physics
  • Mesoscopic physics
  • Spintronics

Background:

  • Investigating nonequilibrium spin accumulation in mesoscopic systems is crucial for understanding quantum transport phenomena.
  • Rashba spin-orbit coupling significantly influences electron spin dynamics in low-dimensional structures.

Purpose of the Study:

  • To investigate the nonequilibrium spin accumulation in a one-dimensional (1D) mesoscopic Rashba ring under unpolarized current injection.
  • To analyze the effects of Rashba spin-orbit coupling and interface scattering on spin accumulation patterns.

Main Methods:

  • Theoretical investigation of spin accumulation in a 1D mesoscopic Rashba ring.
  • Analysis of electron transport through ideal leads and interfaces.
  • Examination of the role of spin-dependent resonant states and the Aharonov-Casher effect.

Main Results:

  • A beating pattern in spin accumulation arises from Rashba spin-orbit coupling and back-scattering.
  • Plateau structures in spin accumulation are observed with complete beating periods, while incomplete periods create transitional regions.
  • The Aharonov-Casher effect leads to quasi-periodic oscillations in average spin accumulation with zeros, and voltage-induced reversal of spin accumulation direction is possible.

Conclusions:

  • The interplay of Rashba spin-orbit coupling and interface effects dictates complex spin accumulation dynamics in 1D rings.
  • Spin-dependent resonant states and the Aharonov-Casher effect are key to understanding the observed phenomena.
  • The voltage-controlled reversal of spin accumulation offers potential for spintronic device applications.