Observation of universal dynamics in an isolated one-dimensional Bose gas far from equilibrium

S. Erne; R. Buecker; T. Gasenzer; J. Berges; J. Schmiedmayer

doi:10.1038/s41586-018-0667-0

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arXiv · 1805.12310

Observation of universal dynamics in an isolated one-dimensional Bose gas far from equilibrium

S. Erne·R. Buecker·T. Gasenzer·J. Berges·J. Schmiedmayer

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Abstract

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 specifics 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 may lead to a comprehensive classification of systems based on their universal properties far from equilibrium, relevant for a large variety of systems at different scales.

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S. Erne, R. Buecker, T. Gasenzer, J. Berges, J. Schmiedmayer. 2018-05-31. Observation of universal dynamics in an isolated one-dimensional Bose gas far from equilibrium. https://doi.org/10.1038/s41586-018-0667-0

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