Berlin 2015 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 103: Transport: Poster Session

TT 103.19: Poster

Donnerstag, 19. März 2015, 15:00–18:00, Poster B

Coherent Dynamics of Quantum Spins in Magnetic Environments — •Lars-Hendrik Frahm, Christoph Hübner, Benjamin Baxevanis und Daniela Pfannkuche — 1. Institut für Theoretische Physik, Universität Hamburg, Hamburg, Germany

We investigate equilibration and transport effects of a quantum spin that is exchange coupled to two electron reservoirs. We include an effective crystal field, which arises from the substrate the spin is living on and gives the spin an easy axis for alignment. First, we determine stationary states using a quantum master equation and compare our results to a semi-classical approach using a rate equation. Second, we consider a spin-polarized electron reservoir that breaks the rotation symmetry around the spin quantization axis. This system 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 spin system by especially focusing on the non-linear influence of the spin torque effect.