Regensburg 2016 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 78: Correlated Electrons: Poster Session

TT 78.47: Poster

Donnerstag, 10. März 2016, 15:00–18:30, Poster D

Spin chains with weak dissipation and pumping — •Florian Lange, Zala Lenarčič, and Achim Rosch — Universität zu Köln

We consider one-dimensional spin chains weakly coupled to the environment. The coupling is described by a Lindblad equation. Such a setup could, for example, be spin chains coupled to a bath of nuclear spins, by ultracold atoms or by atoms in cavities. In the limit of weak coupling, the steady state density matrix is approximately described by a (generalized) Gibbs ensemble. The parameters of this ensemble are obtained by tracking the evolution of the (approximate) conservation laws of the system arising from the coupling to the bath. Details of the couplings strongly influence the steady state and the system can be tuned to low, high or negative temperatures. Integrable and non-integrable spin chains show qualitatively different behaviour.