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Equilibrium spin current in graphene with Rashba spin-orbit coupling.

Huan Zhang1, Zhongshui Ma2, Jun-Feng Liu1

  • 1Department of Physics, South University of Science and Technology of China, Shenzhen 518055, P.R. China.

Scientific Reports
|September 25, 2014
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Summary
This summary is machine-generated.

Researchers explored equilibrium spin current (ESC) in graphene with Rashba spin-orbit coupling (RSOC). They discovered ESC can penetrate normal graphene, offering a new method for pure spin current generation at room temperature.

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Area of Science:

  • Condensed matter physics
  • Materials science

Background:

  • Equilibrium spin current (ESC) is a known phenomenon in 2D electron gases with Rashba spin-orbit coupling (RSOC).
  • Graphene's unique electronic properties make it a promising platform for spintronic applications.

Purpose of the Study:

  • Investigate the behavior of equilibrium spin current (ESC) in graphene with Rashba spin-orbit coupling (RSOC).
  • Explore the penetration of ESC through normal graphene layers without RSOC.
  • Understand the underlying mechanisms and potential applications of ESC in graphene.

Main Methods:

  • Theoretical study of ESC in infinite graphene with uniform RSOC.
  • Analysis of ESC in a system with a normal graphene strip sandwiched between RSOC graphene sheets.
  • Investigating spin-filtered scattering effects.

Main Results:

  • ESC in graphene with uniform RSOC is proportional to λ(2) (Rashba strength squared), primarily near Dirac points.
  • A λ(3) dependence of ESC is observed far from Dirac points, similar to normal 2D electron gases.
  • ESC was found to penetrate through a normal graphene layer, perpendicular to the interface, without RSOC.

Conclusions:

  • The study advances the understanding of ESC in graphene systems.
  • Demonstrates a novel method for generating pure spin currents in graphene via ESC penetration.
  • ESC in graphene with experimentally accessible RSOC is robust and persists at room temperature.