hal-00596704, version 1
Ultrafast magnetization dynamics in diluted magnetic semiconductors
New Journal of Physics 11 (2009) 073010
Résumé : We present a dynamical model that successfully explains the observed time evolution of the magnetization in diluted magnetic semiconductor quantum wells after weak laser excitation. Based on the pseudo-fermion formalism and a second-order many-particle expansion of the exact p-d exchange interaction, our approach goes beyond the usual mean-field approximation. It includes both the sub-picosecond demagnetization dynamics and the slower relaxation processes that restore the initial ferromagnetic order in a nanosecond timescale. In agreement with experimental results, our numerical simulations show that, depending on the value of the initial lattice temperature, a subsequent enhancement of the total magnetization may be observed within the timescale of a few hundred picoseconds.
- 1 :
- Université de Strasbourg – CNRS : UMR7504
- 2 :
- CNRS : UMR7005 – INRIA – Université de Strasbourg – Université de Lorraine
- Domaine : Physique/Physique Quantique
Physique/Matière Condensée/Science des matériauxPhysique/Matière Condensée/Autre - Mots-clés : diluted magnetic semiconductor quantum wells – ultrafast demagnetization
- Commentaire : 12 pages
- hal-00596704, version 1
- http://hal.archives-ouvertes.fr/hal-00596704
- oai:hal.archives-ouvertes.fr:hal-00596704
- Contributeur :
- Soumis le : Lundi 30 Mai 2011, 17:48:16
- Dernière modification le : Mardi 7 Juin 2011, 13:47:28
Documents associés
Exporter