Hannover 2013 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 56: Poster III
Q 56.45: Poster
Donnerstag, 21. März 2013, 16:00–18:30, Empore Lichthof
Dipolar Bose-Einstein condensates with periodically modulated contact interaction — •Branko Nikolić1, 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
Harmonically trapped Bose-Einstein condensates (BECs) with a sufficiently strong dipolar interaction possess both a stable and an unstable equilibrium. Following Ref. [1] we investigate how the stability of both equilibria change under parametric excitation by a periodic modulation of the s-wave scattering length [2]. To this end we perform both an analytical linear and a numerical nonlinear stability analysis for the Thomas-Fermi solution of the underlying Gross-Pitaevskii equation [3]. We find that parametric excitation can stabilize a previously unstable dipolar BEC and vice versa. We even find indications that bistability may exist for a certain choice of driving amplitude and frequency.
[1] W. Cairncross and A. Pelster, eprint arXiv:1209.3148
[2] S.E. Pollack, et al., Phys. Rev. A 81, 053627 (2010)
[3] D.H.J. O’Dell, S. Giovanazzi, and C. Eberlein, Phys. Rev. Lett. 92, 250401 (2004)