Dynamical Equilibration Across a Quenched Phase Transition in a Trapped Quantum Gas

Autor: Liu, I. -K., Donadello, S., Lamporesi, G., Ferrari, G., Gou, S. -C., Dalfovo, F., Proukakis, N. P.
Rok vydání: 2017
Předmět:
Zdroj: Communications Physics, 1, 24 (2018)
Druh dokumentu: Working Paper
DOI: 10.1038/s42005-018-0023-6
Popis: The formation of an equilibrium quantum state from an uncorrelated thermal one through the dynamical crossing of a phase transition is a central question of non-equilibrium many-body physics. During such crossing, the system breaks its symmetry by establishing numerous uncorrelated regions separated by spontaneously-generated defects, whose emergence obeys a universal scaling law with the quench duration. Much less is known about the ensuing re-equilibrating or "coarse-graining" stage, which is governed by the evolution and interactions of such defects under system-specific and external constraints. In this work we perform a detailed numerical characterization of the entire non-equilibrium process, addressing subtle issues in condensate growth dynamics and demonstrating the quench-induced decoupling of number and coherence growth during the re-equilibration process. Our unique visualizations not only reproduce experimental measurements in the relevant regimes, but also provide valuable information in currently experimentally-inaccessible regimes.
Comment: Supplementary Movie Previes: SM-Movie-1: https://youtu.be/3q7-CvuBylg SM-Movie-2: https://youtu.be/-Gymaiv9rC0 SM-Movie-3: https://youtu.be/w-O2SPiw3nE SM-Movie-4: https://youtu.be/P4xGyr4dwKI
Databáze: arXiv