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Hanle effect driven by weak localization.

I S Lyubinskiy1, V Yu Kachorovskii

  • 1A. F. Ioffe Physical-Technical Institute, 26 Polytechnicheskaya Street, Saint Petersburg, 194021, Russia.

Physical Review Letters
|March 24, 2005
PubMed
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Weak localization significantly alters the Hanle effect in two-dimensional systems. This quantum interference phenomenon dictates spin polarization changes under magnetic fields, especially in specific quantum well structures.

Area of Science:

  • Condensed Matter Physics
  • Quantum Mechanics
  • Spintronics

Background:

  • The Hanle effect describes the change in spin polarization due to an external magnetic field.
  • Spin-orbit coupling in two-dimensional systems leads to a spin-split spectrum.
  • Weak localization is a quantum interference effect that enhances backscattering in disordered systems.

Purpose of the Study:

  • To investigate the influence of weak localization on the Hanle effect in two-dimensional systems.
  • To analyze how weak localization modifies the dependence of spin polarization on magnetic fields.
  • To explore the role of quantum interference in spin dynamics under magnetic fields.

Main Methods:

  • Theoretical analysis of spin polarization in a two-dimensional system with a spin-split spectrum.

Related Experiment Videos

  • Consideration of weak localization effects within the framework of quantum interference.
  • Examination of specific quantum well structures (III-V [110] and [100] with equal spin-orbit coupling strengths).

    • Main Results:

    • Weak localization drastically alters the magnetic field dependence of stationary spin polarization (S).
    • Nonanalytic dependence of S on the external magnetic field (B) is predicted for specific quantum wells.
    • Discontinuities in spin polarization components at B=0 and magnetic field-induced rotation driven by quantum interference are observed.

    Conclusions:

    • The Hanle effect in these weakly localized systems is predominantly driven by weak localization.
    • Quantum interference effects are crucial for understanding spin polarization dynamics in the low magnetic field regime.
    • The findings highlight the significant impact of weak localization on spintronic phenomena in quantum wells.