Femtosecond Coherent Control of Spins in (Ga, Mn)As Ferromagnetic Semiconductors Using Light

TitleFemtosecond Coherent Control of Spins in (Ga, Mn)As Ferromagnetic Semiconductors Using Light
Publication TypeJournal Article
Year of Publication2009
AuthorsKapetanakis MD, Perakis IE, Wickey KJ, Piermarocchi C, Wang J
Journal TitlePhysical Review Letters
Volume103
Pages047404
Date PublishedJul 24
ISBN Number0031-9007
Accession NumberISI:000268307400070
Keywordsbrillouin-zone, l-point, magnetization, magnetooptics, semimagnetic semiconductors
Abstract

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

URL<Go to ISI>://000268307400070
DOI10.1103/Physrevlett.103.047404