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Q: Fachverband Quantenoptik und Photonik

Q 48: Quantum Gases: Effects of Interactions

Q 48.7: Talk

Thursday, March 17, 2011, 12:00–12:15, SCH 251

Stability of Bose-Einstein condensates: Variational and numerical approach — •Manuel Kreibich, Jörg Main, and Günter Wunner — 1. Institut für Theoretische Physik, Universität Stuttgart

We analyze the stability of Bose-Einstein condensates by two methods: First by solving the Bogoliubov-de Gennes equations which yields the numerically exact stability eigenvalues. Second with the ansatz of coupled Gaussians within the framework of the time dependent variational principle. For the lowest eigenvalues we find good agreement. However, not all Bogoliubov eigenmodes can be described by the simple ansatz of coupled Gaussians. We modify the original ansatz in such a way that the complete Bogoliubov eigenspectrum can be obtained.