Universal dynamics in an isolated quantum many body system far from equilibrium

Speaker: Joerg Schmiedmayer, Vienna Center for Quantum Science and Technology, Atominstitut, TU-Wien

When: September 7, 2018 (Fri), 12:00PM to 01:00PM (add to my calendar)
Location: SCI 352
Hosted by: Anatoli Polkovnikov

This event is part of the Condensed Matter Theory Seminar Series.

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 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.

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

S. Erne et al. arXiv:1805.12310