Magnetization dynamics down to a zero field in dilute (Cd,Mn)Te quantum wells

The evolution of the magnetization in (Cd,Mn)Te quantum wells after a short pulse of magnetic field was determined from the giant Zeeman shift of spectroscopic lines. The dynamics in the absence of a static magnetic field was found to be up to 3 orders of magnitude faster than that at 1 T. Hyperfine...

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Veröffentlicht in:	Physical review letters 2009-01, Vol.102 (4), p.046408-046408, Article 046408
Hauptverfasser:	Goryca, M, Ferrand, D, Kossacki, P, Nawrocki, M, Pacuski, W, Maślana, W, Gaj, J A, Tatarenko, S, Cibert, J, Wojtowicz, T, Karczewski, G
Format:	Artikel
Sprache:	eng
Schlagworte:	Condensed Matter Materials Science Mesoscopic Systems and Quantum Hall Effect Physics
Online-Zugang:	Volltext
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Zusammenfassung:	The evolution of the magnetization in (Cd,Mn)Te quantum wells after a short pulse of magnetic field was determined from the giant Zeeman shift of spectroscopic lines. The dynamics in the absence of a static magnetic field was found to be up to 3 orders of magnitude faster than that at 1 T. Hyperfine interaction and strain are mainly responsible for the fast decay. The influence of a hole gas is clearly visible: at zero field anisotropic holes stabilize the system of Mn ions, while in a magnetic field of 1 T they are known to speed up the decay by opening an additional relaxation channel.
ISSN:	0031-9007 1079-7114
DOI:	10.1103/physrevlett.102.046408