Dresden 2011 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 2: Quantum Gases: Bosons 1

Q 2.10: Vortrag

Montag, 14. März 2011, 12:45–13:00, HÜL 386

Numerical simulations on space-time lattices for macroscopic quantum tunneling of Bose-Einstein condensates with attractive 1/r-interaction — •Pascal Wieland, Jörg Main, and Günter Wunner — 1. Institut für Theoretische Physik, Universität Stuttgart

For a special laser-configuration one can induce a self-trapped BEC with an attractive 1/r-interaction which can be described by the Gross-Pitaevskii equation (GPE). Those BECs can collapse due to macroscopic quantum tunneling. The tunneling rate can be calculated with the Euclidean action of the bounce trajectory. We search for the numerical exact bounce trajectory by simulations on a space-time lattice. The time propagation is computed via a split-operator method and the continuity conditions for all time steps are determined using a Newton algorithm.