CANES Seminar--Vortices and Phase transitions in low dimensional driven open quantum systems

Professor Sebastian Diehl

Institute for Theoretical Physics, University of Cologne, Germany

Wednesday 24 May
Time: 4pm
Venue: King's College London, Strand Campus, King's Building, Room K-1.56
Contact: CANES Centre Manager
Tel: 0207 848 7951

Recent developments in diverse areas - ranging from cold atomic gases over light-driven semiconductors to microcavity arrays - move systems into the focus, which are located on the interface of quantum optics, many-body physics and statistical mechanics. These driven open quantum systems share in common that coherent and driven-dissipative quantum dynamics occur on an equal footing, placing them far away from thermodynamic equilibrium. 

We study such systems in one and two dimensions. Based on a non-equilibrium duality transformation, we argue that the asymptotic correlation function must decay exponentially due to unbound phase defects in both one and two dimensions. In two dimensions, this means that the Kosterlitz-Thouless transition is unstable against infinitesimal non-equilibrium perturbation in large systems. On the other hand, we establish a new entropy driven first order phase transition in one and two dimensions occurring at strong non-equilibrium drive, which is characterized by the onset of deterministic chaos.

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