Coherently photo-induced ferromagnetism in diluted magnetic semiconductors
J. Fernández-Rossier, C. Piermarocchi, P. Chen, A. H. MacDonald, L. J. Sham
Abstract
Ferromagnetism is predicted in undoped diluted magnetic semiconductors illuminated by intense sub-bandgap laser radiation . The mechanism for photo-induced ferromagnetism is coherence between conduction and valence bands induced by the light which leads to an optical exchange interaction. The ferromagnetic critical temperature TC depends both on the properties of the material and on the frequency and intensity of the laser and could be above 1 K.
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