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PV: Plenarvorträge

PV XVI

PV XVI: Plenarvortrag

Freitag, 15. März 2019, 08:15–09:00, U Audimax

Universal dynamics far from equilibrium — •Jörg Schmiedmayer — Vienna Center for Quantum Science and Technology, Atominstitut, TU-Wien

We provide experimental evidence of universal dynamics far from equilibrium during the relaxation of an isolated one-dimensional Bose gas. Following a rapid cooling quench, the system exhibits universal scaling in time and space, associated with the approach of a non-thermal fixed point. The time evolution within the scaling period is described by a single universal function and scaling exponent, independent of the species of the initial state. Our results provide a quantum simulation in a regime, where to date no theoretical predictions are available. This constitutes a crucial step in the verification of universality far from equilibrium. If successful, this will lead to a comprehensive classification of systems far from equilibrium based on their universal properties similar to the universality classes in phase transitions. This can be the basis for a new type of quantum simulation that let us explore a large variety of systems at different scales.

This work was supported by the ERC (QuantumRelax) and the DFG/FWF SFB ISOQUANT.

S. Erne et al. Nature 253, 225 (2018) arXiv:1805.12310.
For a similar experiment in a spin system see: M. Prüfer et al. Nature 253, 217 (2018) arXiv:1805.11881