Theory of spin waves in diluted-magnetic-semiconductor quantum wells

Diego Frustaglia, Jürgen König, and Allan H. MacDonald
Phys. Rev. B 70, 045205 – Published 22 July 2004

Abstract

We present a theory of collective spin excitations in diluted-magnetic-semiconductor quantum wells in which local magnetic moments are coupled via a quasi-two-dimensional gas of electrons or holes. In the case of a ferromagnetic state with partly spin-polarized electrons, we find that the Goldstone collective mode has anomalous k4 dispersion and that for symmetric quantum wells odd parity modes do not disperse at all. We discuss the gap in the collective excitation spectrum which appears when spin-orbit interactions are included.

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  • Received 14 December 2003

DOI:https://doi.org/10.1103/PhysRevB.70.045205

©2004 American Physical Society

Authors & Affiliations

Diego Frustaglia1,2, Jürgen König1,3, and Allan H. MacDonald4

  • 1Institut für Theoretische Festkörperphysik, Universität Karlsruhe, 76128 Karlsruhe, Germany
  • 2NEST-INFM & Scuola Normale Superiore, 56126 Pisa, Italy
  • 3Institut für Theoretische Physik III, Ruhr-Universität Bochum, 44780 Bochum, Germany
  • 4Department of Physics, University of Texas, Austin, Texas 78712, USA

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Issue

Vol. 70, Iss. 4 — 15 July 2004

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