Ultrafast Magnetization Dynamics in Diluted Magnetic Semiconductors

Omar Morandi*, P.-A. Hervieux, G. Manfredi

*Korrespondierende/r Autor/in für diese Arbeit

Publikation: Beitrag in einer FachzeitschriftArtikel

Abstract

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.
Originalspracheenglisch
Aufsatznummer073010
FachzeitschriftNew Journal of Physics
Jahrgang11
DOIs
PublikationsstatusVeröffentlicht - 2009
Extern publiziertJa

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