Collective Character of Spin Excitations in a System of ${\mathrm{M}\mathrm{n}}^{2+}$ Spins Coupled to a Two-Dimensional Electron Gas

Collective Character of Spin Excitations in a System of ${M n}^{2 +}$ Spins Coupled to a Two-Dimensional Electron Gas

F. J. Teran, M. Potemski, D. K. Maude, D. Plantier, A. K. Hassan, A. Sachrajda, Z. Wilamowski, J. Jaroszynski, T. Wojtowicz, and G. Karczewski

Phys. Rev. Lett. 91, 077201 – Published 11 August 2003

Abstract

We have studied the low energy spin excitations in $n$ -type CdMnTe based dilute magnetic semiconductor quantum wells. For magnetic fields for which the energies for the excitation of free carriers and Mn spins are almost identical, an anomalously large Knight shift is observed. Our findings suggest the existence of a magnetic-field-induced ferromagnetic order in these structures, which is in agreement with recent theoretical predictions [J. König and A. H. MacDonald, Phys. Rev. Lett. 91, 077202 (2003)].

Received 3 October 2002

DOI:https://doi.org/10.1103/PhysRevLett.91.077201

Authors & Affiliations

F. J. Teran, M. Potemski, D. K. Maude, D. Plantier, A. K. Hassan, and A. Sachrajda^*

Grenoble High Magnetic Field Laboratory, Max Planck Institut für Festkörperforschung and Centre National de la Recherche Scientifique, B.P. 166, 38042 Grenoble Cedex 9, France

Z. Wilamowski, J. Jaroszynski, T. Wojtowicz, and G. Karczewski

Institute of Physics, Polish Academy of Sciences, 02668 Warsaw, Poland

^*Permanent address: Institute for Microstructural Sciences, NRC, Ottawa, Canada K1A 0R6.

EPR and Ferromagnetism in Diluted Magnetic Semiconductor Quantum Wells

Jürgen König and Allan H. MacDonald

Phys. Rev. Lett. 91, 077202 (2003)

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Vol. 91, Iss. 7 — 15 August 2003

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Physical Review Letters

Collective Character of Spin Excitations in a System of ${M n}^{2 +}$ Spins Coupled to a Two-Dimensional Electron Gas

F. J. Teran, M. Potemski, D. K. Maude, D. Plantier, A. K. Hassan, A. Sachrajda, Z. Wilamowski, J. Jaroszynski, T. Wojtowicz, and G. Karczewski

Phys. Rev. Lett. 91, 077201 – Published 11 August 2003

Abstract

Authors & Affiliations

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EPR and Ferromagnetism in Diluted Magnetic Semiconductor Quantum Wells

Jürgen König and Allan H. MacDonald

Phys. Rev. Lett. 91, 077202 (2003)

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Physical Review Letters

Collective Character of Spin Excitations in a System of Mn2+ Spins Coupled to a Two-Dimensional Electron Gas

F. J. Teran, M. Potemski, D. K. Maude, D. Plantier, A. K. Hassan, A. Sachrajda, Z. Wilamowski, J. Jaroszynski, T. Wojtowicz, and G. Karczewski

Phys. Rev. Lett. 91, 077201 – Published 11 August 2003

Abstract

Authors & Affiliations

See Also

EPR and Ferromagnetism in Diluted Magnetic Semiconductor Quantum Wells

Jürgen König and Allan H. MacDonald

Phys. Rev. Lett. 91, 077202 (2003)

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Collective Character of Spin Excitations in a System of ${M n}^{2 +}$ Spins Coupled to a Two-Dimensional Electron Gas