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Phys Rev Lett. 2009 Jul 24;103(4):047404. Epub 2009 Jul 24.

Femtosecond coherent control of spins in (Ga,Mn)As ferromagnetic semiconductors using light.

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Department of Physics, University of Crete, Heraklion, Crete 71003, Greece and Institute of Electronic Structure & Laser, Foundation for Research and Technology-Hellas, Heraklion, Crete 71110, Greece.


Using density matrix equations of motion, we predict a femtosecond collective spin tilt triggered by nonlinear, near-ultraviolet (approximately 3 eV), coherent photoexcitation of (Ga,Mn)As ferromagnetic semiconductors with linearly polarized light. This dynamics results from carrier coherences and nonthermal populations excited in the {111} equivalent directions of the Brillouin zone and triggers a subsequent uniform precession. We predict nonthermal magnetization control by tuning the laser frequency and polarization direction. Our mechanism explains recent ultrafast pump-probe experiments.

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