Berlin 2018 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 99: Poster Session: Transport

TT 99.25: Poster

Donnerstag, 15. März 2018, 15:00–19:00, Poster B

Electronic transport through quantum-dot spin valves - ISPI results — •Simon Mundinar, Stephan Weiss, and Jürgen König — Theoretische Physik, Universität Duisburg-Essen and CENIDE, Lotharstr. 1, 47048 Duisburg

We study an interacting quantum dot coupled to ferromagnetic leads that introduce spin-dependent tunneling. We use a path integral approach to derive the tunneling current as functional derivative of the Keldysh partition function. The lead degrees of freedom are integrated out exactly and the on-dot interaction is decoupled via a Hubbard-Stratonovich transformation. The resulting Keldysh path sum is calculated using the technique of iterative summation of path integrals (ISPI) [1]. ISPI is based on the truncation of lead-induced correlations after a characteristic memory time. This method enables us to calculate the tunneling current through the system for different system parameters, such as gate/bias voltage, polarization, angle between the two leads’ magnetizations and Coulomb interaction strength.
S. Weiss, R. Hützen, D. Decker, J. Eckel, R. Egger, and M. Thorwart, Phys. Status Solidi B 250, 2298 (2013)