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Q: Fachverband Quantenoptik und Photonik
Q 23: Quantum gases: Interaction effects II
Q 23.4: Vortrag
Dienstag, 19. März 2013, 12:00–12:15, E 001
Bistability in Bose-Einstein condensates with attractive two-body and repulsive three-body contact interaction — Hamid Al-Jibbouri1, •Antun Balaž2, and Axel Pelster3 — 1Fachbereich Physik, Freie Universität Berlin, Germany — 2SCL, Institute of Physics Belgrade, University of Belgrade, Serbia — 3Fachbereich Physik, Technische Universität Kaiserslautern, Germany
The effects of three-body contact interactions on the properties of harmonically trapped Bose-Einstein condensates are usually quite small. Only in exceptional circumstances, e.g. in the presence of geometric resonances [1], such effects can reach the level of a few percent of two-body effects, and thus become experimentally observable. However, in the case of an attractive Bose-Einstein condensate, the repulsive three-body interaction can stabilize the system against collapse by increasing the critical number of atoms. Furthermore, motivated by Ref. [2], we show that the system parameters can be tuned in such a way that two stable equilibria coexist. Following Ref. [3] we use a variational approach and perform a detailed numerical analysis of the underlying cubic-quintic Gross-Pitaevskii equation to study the occurrence of a possible bistability.
[1] H. Al-Jibbouri, et al., eprint arXiv:1208.0991
[2] A. Montina and F. T. Arecchi, Phys. Rev. A 66, 013605 (2002)
[3] I. Vidanović, et al., Phys. Rev. A 84, 013618 (2011)