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Spin Hall drag in electronic bilayers.

S M Badalyan1, G Vignale

  • 1Department of Physics, University of Regensburg, 93040 Regensburg, Germany.

Physical Review Letters
|April 7, 2010
PubMed
Summary
This summary is machine-generated.

We predict a new spin Hall drag effect in electronic bilayers, where current in one layer generates spin accumulation in another. This arises from spin-orbit and Coulomb interactions, with observable effects in optical experiments.

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Area of Science:

  • Condensed matter physics
  • Spintronics
  • Quantum mechanics

Background:

  • Electronic bilayers exhibit complex interactions.
  • Spin-orbit and Coulomb interactions are fundamental in condensed matter systems.
  • Spin transport phenomena are crucial for next-generation electronics.

Purpose of the Study:

  • To theoretically predict and analyze a novel phenomenon: spin Hall drag in electronic bilayers.
  • To elucidate the underlying physical mechanisms driving spin Hall drag.
  • To identify experimental methods for observing this predicted effect.

Main Methods:

  • Theoretical analysis using the Boltzmann equation formalism.
  • Modeling of coupled spin-orbit and Coulomb interactions in bilayer systems.
  • Temperature-dependent analysis of resistivity contributions.

Main Results:

  • Prediction of the spin Hall drag effect: spin accumulation generated across one layer by current in another.
  • Identification of two key contributions to spin Hall drag resistivity: side-jump (T2 dependence) and skew-scattering (T3 dependence).
  • Theoretical prediction of observable spin accumulation via optical rotation experiments.

Conclusions:

  • Spin Hall drag is a novel effect in electronic bilayers driven by combined spin-orbit and Coulomb interactions.
  • The temperature dependence of resistivity provides distinct signatures for different contributions.
  • Optical rotation experiments offer a viable pathway for experimental verification of spin Hall drag.