Düsseldorf 2007 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 37: Quantengase (Tunneln I)

Q 37.3: Talk

Wednesday, March 21, 2007, 12:45–13:00, 6J

Spontaneous emergence of angular momentum Josephson oscillations in coupled annular Bose-Einstein condensates — •Igor Lesanovsky and Wolf von Klitzing — Institute of Electronic Structure and Laser, Foundation for Research and Technology -Hellas, P.O. Box 1527, GR-71110 Heraklion, Greece

We investigate the nonlinear dynamics of two coupled annular Bose-Einstein condensates. We demonstrate that for certain values of the coupling strength a non-rotating state with uniform density is unstable with respect to fluctuations in higher angular momentum modes. We analytically derive the two-branched Bogoliubov spectrum and show that there exist distinct regions of instability enabling one to selectively occupy certain angular momentum modes. Carrying out a numerical propagation of the Gross-Pitaevskii equation we observe after a sufficiently long evolution time the spontaneous emergence of angular momentum Josephson oscillations which break the chiral symmetry of the initial state.

[1] I. Lesanovsky and W. v. Klitzing, preprint:quant-ph/0609133 (2006)