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Q: Fachverband Quantenoptik und Photonik

Q 38: Quantengase: Optische Gitter 3

Q 38.6: Vortrag

Donnerstag, 15. März 2012, 12:00–12:15, V53.01

Reservoir induced criticality in bosonic lattice systems — •Matthias Moos, Michael Höning, and Michael Fleischhauer — Fachbereich Physik and Forschungszentrum OPTIMAS, Technische Universität Kaiserslautern, 67663 Kaiserslautern, Germany

We discuss reservoir driven phase transitions to critical states in one-dimensional bosonic lattices subject to local dissipation. By coupling to local reservoirs fermionic and bosonic lattice systems can be driven to a steady state which shows criticality in the sense of a diverging correlation length. For free bosonic systems this criticality is generically associated with a dynamical instability. To avoid this instability we introduce a nonlinearity by saturating the dissipative gain. We consider local reservoir couplings of different range and derive correlations as well as critical exponents of the induced quasi-phase transition in a mean-field approximation.