Ultrafast Magnetization Dynamics in Diluted Magnetic Semiconductors

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

*Corresponding author for this work

Research output: Contribution to journalArticle

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.
Original languageEnglish
Article number073010
JournalNew Journal of Physics
Volume11
DOIs
Publication statusPublished - 2009
Externally publishedYes

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