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Suspended nanowires as mechanically controlled Rashba spin splitters.

R I Shekhter1, O Entin-Wohlman, A Aharony

  • 1Department of Physics, Göteborg University, SE-412 96 Göteborg, Sweden.

Physical Review Letters
|November 12, 2013
PubMed
Summary
This summary is machine-generated.

Suspended nanowires act as tunable spin current generators. Mechanical bending controls electron spin splitting, creating spin currents independent of charge transfer, temperature, or voltage.

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Area of Science:

  • Spintronics
  • Nanoscience
  • Condensed Matter Physics

Background:

  • Electron spin manipulation is crucial for advanced electronics.
  • Rashba spin-orbit interaction offers a pathway for spin control.
  • Nanoelectromechanical systems (NEMS) provide tunable platforms.

Purpose of the Study:

  • To investigate the use of suspended nanowires for mechanically controlled spin manipulation.
  • To explore the generation of spin currents independent of charge.
  • To demonstrate tunability of spin splitting using mechanical and environmental factors.

Main Methods:

  • Utilizing suspended nanowires as nanoelectromechanical weak links.
  • Leveraging Rashba spin-orbit interaction for spin-state mixing and splitting.
  • Populating reservoirs with imbalanced spin-up and spin-down electrons.

Main Results:

  • Demonstrated mechanically controlled coherent mixing/splitting of electron spin states.
  • Observed generation of spin currents without charge transfer, independent of temperature/voltage.
  • Showcased tunability of spin splitters via mechanical vibrations, magnetic fields, and temperature.
  • Identified metallic carbon nanotubes as promising candidates for high spin conductance.

Conclusions:

  • Suspended nanowires offer a novel, mechanically tunable platform for spintronics.
  • The developed system generates pure spin currents, a key goal in spintronics research.
  • Carbon nanotubes show potential for efficient spin-charge conductance ratios.