CQD Special Seminar

4. July 2018 15:45

Seminar Box 2.107, Kirchhoff-Institut für Physik, INF 227

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

Dr. I-Kang (Gary) Liu
Newcastle University, UK

We investigate the dynamical equilibration of an uncorrelated thermal Bose gas passing through a Bose-Einstein condensate phase transition. During such crossing, the system breaks its symmetry resulting in numerous uncorrelated regions separated by the spontaneously generated defects. The emergence of spontaneous defects formation obeys a universal scaling law with quench duration, well known as Kibble-Zurek mechanism. The ensuing re-equilibration stage is govern by the evolution and interactions of such defects under system-specific and external constraints. We perform a detailed numerical characterization of the entire non-equilibrium process in an elongated ultra-cold Bose gas with fully three-dimensional classical-field simulations, addressing subtle issues and demonstrating the quenched-induced decoupling of condensate atom number and coherence growth during the re-equilibration process. Our findings agree with experimental observations made at the later stage of the quench, and provide the information via useful dynamical visualization in currently experimentally inaccessible regimes.


Prof. Dr. M. Weidemüller
Physikalisches Institut
Im Neuenheimer Feld 226
69120 Heidelberg
Claudia Krämer
21.6.2023 16:15 / 17:00
Dipolar quantum gases: From rotons to supersolids to vortices
Dr. Manfred Johann Mark, Institut für Experimentalphysik, Universität Innsbruck, INF 227, Hörsaal 1