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Related Experiment Videos

Electrical Spin Orientation, Spin-Galvanic, and Spin-Hall Effects in Disordered Two-Dimensional Systems.

D S Smirnov1, L E Golub1

  • 1Ioffe Institute, 194021 St. Petersburg, Russia.

Physical Review Letters
|April 4, 2017
PubMed
Summary

This study presents a unified theory for spin effects in disordered systems under hopping conductivity. It reveals spin polarization increases exponentially with localization sites, crucial for low-temperature spintronics.

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Area of Science:

  • Condensed Matter Physics
  • Spintronics
  • Materials Science

Background:

  • Spin phenomena in disordered systems at low temperatures differ significantly from delocalized carrier systems.
  • Hopping conductivity is a key transport regime in such systems, impacting spin dynamics.

Purpose of the Study:

  • To develop a unified microscopic theory for current-induced spin orientation, spin-galvanic, and spin-Hall effects in the 2D hopping regime.
  • To elucidate the relationship between these spin effects and the interplay of drift and diffusion spin currents.

Main Methods:

  • Development of a unified microscopic theory.
  • Application of percolation theory for estimations in semiconductor heterostructures.
  • Analysis of the interplay between drift and diffusion spin currents.

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Main Results:

  • Demonstrated proportionality between spin-galvanic, spin-Hall effects, and current-induced spin orientation susceptibilities.
  • Showed these effects are governed by the balance of drift and diffusion spin currents.
  • Quantified exponential increase in electrical spin polarization with localization site concentration in the hopping regime.

Conclusions:

  • The developed theory provides a comprehensive understanding of spin transport in the 2D hopping regime.
  • Electrical spin polarization can reach significant levels (a few percent) near the hopping-diffusion conductivity transition.
  • Findings are relevant for designing spintronic devices operating at low temperatures in disordered semiconductors.