Stuttgart 2012 – wissenschaftliches Programm
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.