Regensburg 2010 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 36: TR: Poster Session
TT 36.2: Poster
Donnerstag, 25. März 2010, 14:00–18:00, Poster A
Nonequilibrium transport through a correlated quantum dot with magnetic impurity — •Daniel Becker1, Stephan Weiss2, Jens Eckel3, Michael Thorwart3, and Daniela Pfannkuche1 — 1I. Institute for Theoretical Physics, University of Hamburg, D-20355 Hamburg, Germany — 2Niels Bohr Instituttet, Nano-Science Centret, Universitetsparken 5, DK-2100 Copenhagen, Denmark — 3FRIAS, Albert-Ludwigs-Universität Freiburg, Albertstr.19, 79104 Freiburg, Germany
The iterative summation of path integrals (ISPI)[1] is adopted to a single-level quantum dot, in which a quantum spin-1/2 magnetic impurity interacts with the dot-electron spins. For two electrons on the dot, Coulomb interaction is taken into account. Based on a generating function, the tunneling current at finite bias voltages and the orientation of the impurity spin are calculated numerically. The scheme is deterministic by construction and non-perturbative and allows to study real-time nonequilibrium transport for strong electron-impurity and Coulomb interaction, even at low temperatures and for a wide range of bias voltages. Of particular interest is the mutual influence between tunneling current and the impurity spin dynamics in the presence of the Coulomb interaction and a magnetic field.
[1] S. Weiss et al., Phys. Rev. B 77, 195316 (2008)