Regensburg 2010 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 18: TR: Quantum Coherence and Quantum Information Systems 1

TT 18.2: Vortrag

Dienstag, 23. März 2010, 14:15–14:30, H21

Landau-Zener Transitions in a Dissipative Environment: Numerically Exact Results — •Peter Nalbach and Michael Thorwart — Freiburg Institute for Advanced Studies (FRIAS), Albert-Ludwigs-Universität Freiburg, Albertstraße 19, 79104 Freiburg, Germany

We study Landau-Zener transitions in a dissipative environment by means of the numerically exact quasiadiabatic propagator path-integral [1]. It allows to cover the full range of the involved parameters. We discover a nonmonotonic dependence of the transition probability on the sweep velocity which is explained in terms of a simple phenomenological model. This feature, not captured by perturbative approaches, results from a nontrivial competition between relaxation and the external sweep.

[1] P. Nalbach and M. Thorwart, Phys. Rev. Lett. 103, 220401 (2009)