Related Experiment Video
Updated: May 13, 2026

Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
Published on: March 30, 2017
Universal rephasing dynamics after a quantum quench via sudden coupling of two initially independent condensates
Emanuele G Dalla Torre1, Eugene Demler, Anatoli Polkovnikov
1Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA.
Abstract:
We consider a quantum quench in which two initially independent condensates are suddenly coupled and study the subsequent "rephasing" dynamics. For weak tunneling couplings, the time evolution of physical observables is predicted to follow universal scaling laws, connecting the short-time dynamics to the long-time nonperturbative regime. We first present a two-mode model valid in two and three dimensions and then move to one dimension, where the problem is described by a gapped sine-Gordon theory. Combining analytical and numerical methods, we compute universal time-dependent expectation values, allowing a quantitative comparison with future experiments.
Related Concept Videos
Double Resonance Techniques: Overview
Spin decoupling is usually achieved by...
Phase Transitions: Vaporization and Condensation
Entropy Change in Reversible Processes
The statement can be further generalized to prove that entropy is a state function. Take a cyclic process between any two points on a p-V diagram.
Phase Transitions
Phase Transitions
Atomic Nuclei: Nuclear Relaxation Processes

