Date/Time
Date(s) - 23/06/2011
2:20 pm - 3:20 pm

Title: Solitons and Phase Domains During the Cooling of a One-Dimensional Ultra-Cold Gas

Speaker: Dr. Piotr Deuar

Institute: Polish Academy of Sciences

Location: ABB 162

Description:

The evaporative cooling dynamics of trapped one-dimensional Bose gases was simulated using the classical fields method. Bose-Einstein condensates and quasicondensates were obtained in the final equilibrium state, and we were able to follow the onset of condensation. The results reconcile the Kibble-Zurek mechanism of defect formation with defect-free thermal equilibrium states. The solitons can be interpreted as a “larval stage” of later equilibrium phase fluctuations. However, unlike the usual description of cooling across a critical temperature, we do not see the seeding and growth of phase domains nor formation of defects where they meet. Instead, defects are the dominant entities, and phase domains are fleeting.