6533b82bfe1ef96bd128e3af
RESEARCH PRODUCT
Charge and spin photocurrents in the Rashba model
Stefan BlügelFrank FreimuthFrank FreimuthYuriy MokrousovYuriy Mokrousovsubject
Materials scienceFOS: Physical sciencesPhysics::Optics02 engineering and technology01 natural scienceslaw.inventionMagnetizationlawElectric fieldMesoscale and Nanoscale Physics (cond-mat.mes-hall)0103 physical sciencesddc:530010306 general physicsSpin (physics)Condensed Matter - Mesoscale and Nanoscale PhysicsCondensed matter physicsCondensed Matter::OtherCharge (physics)Condensed Matter::Mesoscopic Systems and Quantum Hall Effect021001 nanoscience & nanotechnologyLaserSymmetry (physics)FerromagnetismFemtosecondCondensed Matter::Strongly Correlated Electrons0210 nano-technologydescription
In metallic noncentrosymmetric crystals and at surfaces the response of spin currents and charge currents to applied electric fields contains contributions that are second order in the electric field, which are forbidden by symmetry in centrosymmetric systems. Thereby, photocurrents and spin photocurrents can be generated in inversion asymmetric metals by the application of femtosecond laser pulses. We study the laser-induced charge current in the ferromagnetic Rashba model with in-plane magnetization and find that this \textit{magnetic photogalvanic effect} can be tuned to be comparable in size to the laser-induced photocurrents measured experimentally in magnetic bilayer systems such as Co/Pt. Additionally, we show that femtosecond laser pulses excite strong spin currents in the nonmagnetic Rashba model when the Rashba parameter is large.
year | journal | country | edition | language |
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2017-10-28 |