Mainz 2017 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 54: Ultracold atoms and BEC - V (with A)

Q 54.8: Vortrag

Freitag, 10. März 2017, 12:45–13:00, N 1

Scaling of a long-range interacting quantum spin system driven out of equilibrium — •Stephan Helmrich, Alda Arias, and Shannon Whitlock — Physikalisches Institut, Universität Heidelberg, Im Neuenheimer Feld 226, 69120 Heidelberg

Complex systems are often found to exhibit unexpectedly simple scaling laws that can signal new physical regimes or universal relations between otherwise very different systems. Although this provides a powerful tool for characterising systems close to equilibrium, there are only few known examples where scaling behavior can be found in dynamical settings. Here we demonstrate power-law scaling in a well-controlled quantum spin system driven out of equilibrium [1]. This enables us to reconstruct the non-equilibrium phase diagram of the system and to identify dissipation-dominated, driving-dominated and interaction-dominated regimes. Comparing the measured scaling laws with kinetic Monte Carlo simulations we uncover the microscopic origin of the observed scalings. This opens up a new means to study and classify quantum systems out of equilibrium and extends the domain where scale-invariant behavior can be found.

[1] S. Helmrich, A. Arias, and S. Whitlock. arXiv:1605.08609, 2016