Spin waves in magnetic quantum wells with Coulomb interaction and sd exchange coupling

F. Perez, J. Cibert, M. Vladimirova, and D. Scalbert
Phys. Rev. B 83, 075311 – Published 22 February 2011

Abstract

We theoretically describe the spin-excitation spectrum of a two-dimensional electron gas embedded in a quantum well with localized magnetic impurities. Compared to the previous work published in [Phys. Rev. B 70, 45205 (2004)] and [Phys. Rev. B 79, 045306 (2009)], we introduce equations that allow us to consider the interplay between the Coulomb interaction of delocalized electrons and the sd exchange coupling between electrons and magnetic impurities. Strong qualitative changes are found: mixed waves propagate below the single-particle continuum, an anticrossing gap is open at a specific wave vector, and the kinetic damping due to the electron motion [Phys. Rev. B 81, 100403 (2010)] strongly influences the coupling strength between electrons and impurities spins.

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  • Received 27 September 2010

DOI:https://doi.org/10.1103/PhysRevB.83.075311

©2011 American Physical Society

Authors & Affiliations

F. Perez*

  • Institut des NanoSciences de Paris, CNRS/Université Paris 6, 4 place Jussieu, F-75005 Paris, France

J. Cibert

  • Institut Néel, CNRS/UJF, BP166, F-38042 Grenoble Cedex 9, France

M. Vladimirova and D. Scalbert

  • Université Montpellier 2, CNRS, Laboratoire Charles Coulomb UMR 5221, F-34095, Montpellier, France

  • *florent.perez@insp.jussieu.fr

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Vol. 83, Iss. 7 — 15 February 2011

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