BOSE-EINSTEIN CONDENSATES IN A TOROIDAL TRAP WITH MOVING BARRIERS

D. M. JEZEK; H. M. CATALDO

Ciudad Autónoma de Buenos Aires

Conferencia; The 27 th International Conference on Low Temperature Physics (LT27),; 2014

We study the dynamics of a BEC confined by a ring-shaped trap with two radial barriers forming an asymmetric double-well system. The barriers can move varying the angle between them. We first construct a two-mode model with a fixed angle. We show that as a direct consequence of a nonvanishing overlap between the ground and excited states, the position of the minimum in the phase diagram is shifted with respect to the symmetric case. We also introduce effective interaction energy parameters which yield a more accurate two-mode dynamics. Finally, by analyzing full Gross-Pitaevskii simulations, we show that all the set of two-mode parameters is necessary to describe the dynamics for moving barriers.