Stuttgart 2012 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 22: Quantengase: Wechselwirkungseffekte 1

Q 22.7: Talk

Tuesday, March 13, 2012, 12:15–12:30, V7.03

Macroscopic quantum tunnelling and bounce solutions of Bose-Einstein condensates with dipolar interactions — •Torsten Schwidder, Jörg Main, and Günter Wunner — 1. Institut für Theoretische Physik, Universität Stuttgart

Macroscopic quantum tunnelling is discussed for Bose-Einstein condensates with dipolar interaction. The decay of a metastable ground state into a collapsing wave function is investigated in a time-dependent variational approach to the nonlinear Gross-Pitaevskii equation. The bounce trajectory is computed in imaginary time using a multi-shooting algorithm, and tunnelling rates are calculated. The fluctuation prefactor is accessible using the monodromy matrix, and the relation to the Gelfand-Yaglom differential equation is shown.