Ultrafast magneto-optics in ferromagnetic III-V semiconductors

Jigang Wang, Chanjuan Sun, Yusuke Hashimoto, Junichiro Kono, Giti A. Khodaparast, Łukasz Cywiński, L. J. Sham, Gary D. Sanders, Christopher J. Stanton, Hiro Munekata

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88 Citations (Scopus)

Abstract

We investigate various ultrafast optical processes in ferromagnetic (III,Mn)V semiconductors induced by femtosecond laser pulses. Two-colour time-resolved magneto-optical spectroscopy has been developed, which allows us to observe a rich array of dynamical phenomena. We isolate several distinct temporal regimes in spin dynamics, interpreting the fast (<1ps) dynamics as spin heating through sp-d exchange interaction between photo-carriers and Mn ions while the ∼100ps component is interpreted as a manifestation of spin-lattice relaxation. Charge carrier and phonon dynamics were also carefully studied, showing an ultrashort charge lifetime of photo-injected electrons (∼2ps) and propagating coherent acoustic phonon wavepackets with a strongly probe energy dependent oscillation period, amplitude and damping.

Original languageEnglish
Article numberR01
Pages (from-to)R501-R530
JournalJournal of Physics Condensed Matter
Volume18
Issue number31
DOIs
Publication statusPublished - 2006 Aug 9

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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