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Recent experimental 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. They share in common that coherent and driven-dissipative quantum dynamics occur on an equal footing, creating scenarios without immediate counterpart in condensed matter. A key challenge is to identify universal macroscopic phenomena, which manifestly witness microscopic non-equilibrium conditions. Here, we will report on three results in this direction. First, we show that dynamical Bose criticality in driven systems lies beyond the equilibrium Halperin- Hohenberg classification. Second, we argue that driven open systems in two dimensions, realized by ensembles of exciton-polaritons, cannot support superfluidity and quasi-long range order. Third, we reveal new, manifestly non- equilibrium scaling behavior in the short time heating dynamics of interacting, ultracold atomic quantum wires.

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Sebastian Diehl, Universität Innsbruck
Seminarraum Theoretische Physik
Contact: not specified