Regensburg 2016 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 81: Transport: Spintronics and Magnetotransport
(Joint session of DS, HL, MA and TT organized by TT)

TT 81.6: Vortrag

Donnerstag, 10. März 2016, 18:00–18:15, H23

Coherent Dynamics of Quantum Spins in Magnetic Environments — •Lars-Hendrik Frahm¹, Christoph Hübner¹, Benjamin Baxevanis^1,2, and Daniela Pfannkuche¹ — ¹1. Institut für Theoretische Physik, Universität Hamburg, 20355 Hamburg, Germany — ²Instituut-Lorentz, Universiteit Leiden, P.O. Box 9506, 2300 RA Leiden, The Netherlands

We investigate equilibration and transport effects of a magnetic atom that is exchange coupled to two electron reservoirs. An effective crystal field, which arises from the substrate the atom is living on gives the spin of the atom an easy axis for alignment. Further, a spin-polarized electron reservoir breaks the rotation symmetry around the spin quantization axis. A proper description of the dynamics of the quantum spin requires to consider the complete density operator, where its knowledge allows to calculate magnetization dynamics and transport properties on an equal footing. We discuss the electron transport through the atomic system by especially focusing on the non-linear influence of the spin torque effect.