Berlin 2018 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 47: Nonequilibrium Quantum Many-Body Systems II (joint session TT/DY)

DY 47.4: Vortrag

Mittwoch, 14. März 2018, 16:00–16:15, H 3010

Non-Equilibrium Steady State Quantum Systems — •Michael Schuett and Markus Mueller — Condensed Matter Theory Group, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland

Recent experimental advances have sparked a growing interest in quantum systems out of equilibrium. Such systems can exhibit phenomena not found in equilibrium. A frequent price payed for this freedom is the intractability of the non-equilibrium system. Here we consider a tractable toy model, rich enough to exhibit interesting non-equilibrium properties in a driven steady state. Being a well characterized fixed point, the steady state selects a specific state from the vast set of out of equilibrium states. The scenario we consider are non-interacting Fermions driven around a mesoscopic scatterer. We construct the driven, current-carrying many-body state, based on non-interacting scattering states and determine the non-equilibrium Friedel oscillations. We show, based on non-interacting scattering states that experimentally detectable oscillatory magnetic field patterns arise from the emerging current pattern. Finally we generalize our construction of the steady states to include interactions and conclude with an outlook on interaction induced instabilities or chaoticity.