Stuttgart 2012 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 34: Poster 1

Q 34.33: Poster

Tuesday, March 13, 2012, 16:30–19:00, Poster.I+II

Extended variational calculations of the stability and dynamics of Bose-Einstein condensates — •Manuel Kreibich, Jörg Main, and Günter Wunner — 1. Institut für Theoretische Physik, Universität Stuttgart, 70550 Stuttgart, Germany

The variational ansatz with coupled Gaussians is capable of predicting accurately the stationary solutions of the Gross-Pitaevskii equation. However, considering the dynamics, this ansatz can only describe monopolar, dipolar and quadrupolar modes. We present new extended variational approaches which are capable of describing, in principle, arbitrary angular momenta in spherically and cylindrically symmetric systems.

Using these approaches we calculate the stability of different systems and compare the results with those obtained by solving the Bogoliubov-de Gennes equations, which yield numerically exact solutions. Furthermore, we investigate the dynamics of Bose-Einstein condensates and observe the angular collapse of dipolar condensates.