Berlin 2018 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 21: Poster I

MA 21.102: Poster

Dienstag, 13. März 2018, 09:30–13:00, Poster A

Spin transport through a contacted Heisenberg chain — •Florian Lange, Satoshi Ejima, and Holger Fehske — Institut für Physik, Ernst-Moritz-Arndt Universität Greifswald, D-17489 Greifswald, Germany

We use the density-matrix renormalization group and time-evolving block decimation algorithms to simulate the spin transport through a short Heisenberg spin chain sandwiched between two noninteracting leads under a spin bias. By using total system sizes up to 200 sites, we can accurately estimate the spin current in the steady state. The dependence of the current-voltage characteristic on the chain length and exchange anisotropy is examined. For the spin-1/2 XXZ chain, we find an activated behavior similar to the charge transport through a Mott-insulating Hubbard chain. In the high spin-voltage regime, a negative differential conductivity due to the finite band width of the leads is observed.