Hannover 2016 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 70: Quantum Gases: Bosons VI

Q 70.1: Talk

Friday, March 4, 2016, 14:30–14:45, f342

Non-equilibrium steady-states in a driven dissipative superfluid — •Bodhaditya Santra, Ralf Labouvie, Simon Heun, and Herwig Ott — Research Center OPTIMAS and Fachbereich Physik, Technische Universität Kaiserslautern, 67663 Kaiserslautern, Germany

Non-equilibrium steady-states constitute fix points of the phase space dynamics of classical and quantum systems. They emerge under the presence of a driving force and lie at the heart of transport phenomena such as heat conduction or current flow.

We experimentally study the steady-states of a driven-dissipative Josephson junction array, realized with a weakly interacting Bose Einstein condensate residing in a one-dimensional optical lattice [1]. Engineered losses on one site act as a local dissipative process, while tunneling from the neighboring sites constitutes the driving force. We characterize the emerging steady-states of this atomtronic device. With increasing dissipation strength the system crosses from a superfluid state, characterized by a coherent DC Josephson current into the lossy site to a resistive state, characterized by an incoherent hopping transport. For intermediate values of the dissipation, the system exhibits bistability, where a superfluid and a resistive branch coexist. We also study the relaxation dynamics towards the steady-state, where we find a critical slowing down, indicating the presence of a non-equilibrium phase transition.

[1] R. Labouvie, B. Santra, S. Heun, H. Ott, arXiv:1507.05007