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Quasi-two-dimensional diluted magnetic semiconductor systems.

D J Priour1, E H Hwang, S Das Sarma

  • 1Condensed Matter Theory Center, Department of Physics, University of Maryland, College Park, MD 20742-4111, USA.

Physical Review Letters
|August 11, 2005
PubMed
Summary
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We present a theory for two-dimensional diluted magnetic semiconductors, predicting ferromagnetic transition temperature (Tc) and magnetization. This model accounts for spatial disorder and finite carrier effects, revealing strong density dependence.

Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Spintronics

Background:

  • Diluted magnetic semiconductors (DMS) are crucial for spintronic applications.
  • Understanding the ferromagnetic coupling in two-dimensional (2D) systems is key.
  • Existing models often simplify disorder effects.

Purpose of the Study:

  • Develop a theory for 2D DMS with confined carriers and local moments.
  • Investigate the impact of spatial disorder on ferromagnetic properties.
  • Predict the ferromagnetic transition temperature (Tc) and magnetization behavior.

Main Methods:

  • Disordered RKKY lattice field theory.
  • Exact inclusion of spatial disorder from random local moment positions.
  • Analysis of finite carrier mean-free path and finite temperature effects.

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Main Results:

  • Predicts ferromagnetic transition temperature (Tc) and spontaneous magnetization nature.
  • Demonstrates strong density dependence of Tc.
  • Highlights deviations from the virtual crystal approximation due to disorder.

Conclusions:

  • The developed theory accurately models 2D DMS.
  • Spatial disorder significantly influences Tc, contrary to simpler approximations.
  • Finite carrier and temperature effects are critical for accurate predictions.