Theory of ferromagnetism in diluted magnetic semiconductor quantum wells

Byounghak Lee, T. Jungwirth, and A. H. MacDonald
Phys. Rev. B 61, 15606 – Published 15 June 2000
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Abstract

We present a mean-field theory of ferromagnetism in diluted magnetic semiconductor quantum wells. When subband mixing due to exchange interactions between quantum well free carriers and magnetic impurities is neglected, analytic result can be obtained for the dependence of the critical temperature and the spontaneous magnetization on the distribution of magnetic impurities and the quantum well width. The validity of this approximate theory has been tested by comparing its predictions with those from numerical self-consistent field calculations. Interactions among free carriers, accounted for using the local-spin-density approximation, substantially enhance the critical temperature. We demonstrate that an external bias potential can tune the critical temperature through a wide range.

  • Received 26 January 2000

DOI:https://doi.org/10.1103/PhysRevB.61.15606

©2000 American Physical Society

Authors & Affiliations

Byounghak Lee

  • Department of Physics, Indiana University, Bloomington, Indiana 47405

T. Jungwirth

  • Department of Physics, Indiana University, Bloomington, Indiana 47405
  • Institute of Physics ASCR, Cukrovarnická 10, 162 00 Praha 6, Czech Republic

A. H. MacDonald

  • Department of Physics, Indiana University, Bloomington, Indiana 47405

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Vol. 61, Iss. 23 — 15 June 2000

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