Berlin 2018 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 72: Poster Session: Correlated Electrons

TT 72.13: Poster

Mittwoch, 14. März 2018, 15:00–19:00, Poster B

Higher order transport mechanisms using matrix product — •Simon Kothe, Lars-Hendrik Frahm, and Daniela Pfannkuche — 1. Institut für Theoretische Physik, Universität Hamburg

We investigate different methods to approach the Kondo regime of an atom that is coupled to two reservoirs. In our model the atom is simplified as a spin, that is biased by a magne- tocrystalline anisotropy field and the exchange interaction to electrons in the reservoirs. As our first approach we use a perturbation ansatz to obtain equations of motion for the reduced density matrix of the spin. This allows us to calculate dynamics of the atom as well as trans- port properties. In our second approach we use matrix product states (MPS) to describe the state of the system and apply the density matrix renormalization group (DMRG) algorithm. The resulting transport properties show the importance of higher order coupling mechanisms.