Femtosecond Coherent Control of Spin with Light in (Ga,Mn)As ferromagnets
arXiv:0908.0707 · doi:10.1103/PhysRevLett.103.047404
Abstract
Using density matrix equations of motion, we predict a femtosecond collective spin tilt triggered by nonlinear, near--ultraviolet (3eV), 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.
4 pages, 3 figures, published in Physical Review Letters
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- Ultrafast spin dynamics in II-VI diluted magnetic semiconductors with spin-orbit interaction
- Discovery of an Unconventional Quantum Echo by Interference of Higgs Coherence
- Collective magnetization dynamics in ferromagnetic (Ga,Mn)As mediated by photo-excited carriers
- Unraveling the spin reorientation process in rare earth perovskite PrFe0.1Cr0.9O3