2018/05/31 by S. Erne, R. Buecker, T. Gasenzer +2
Physics and Astronomy · #cond-mat.quant-gas #cond-mat.stat-mech #quant-ph
paper · pdf · doi:10.1038/s41586-018-0667-0
published as Nature 563, 225 (2018) · 12 pages, 9 figures
arxiv created 2018/05/31 · arxiv updated 2018/11/12
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.