Femtosecond Coherent Control of Spin with Light in (Ga,Mn)As ferromagnets

Details Femtosecond Coherent Control of Spin with Light in (Ga,Mn)As ferromagnets Femtosecond Coherent Control of Spin with Light in (Ga,Mn)As ferromagnets

2009-08-05

arxiv.org/abs/0908.0707v1

Physical Review Letters 103, 047404 (2009)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures, published in Physical Review Letters

Scientific paper

10.1103/PhysRevLett.103.047404

Using density matrix equations of motion, we predict a femtosecond collective spin tilt triggered by nonlinear, near--ultraviolet ($\sim$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.

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