Nonlinear Dynamics of a Bose-Einstein Condensate in a Magnetic Waveguide
  We have studied the internal and external dynamics of a Bose-Einstein condensate in an anharmonic magnetic waveguide. An oscillating condensate experiences a strong coupling between the center of mass motion and the internal collective modes. Due to the anharmonicity of the magnetic potential, not only the center of mass motion shows harmonic frequency generation, but also the internal dynamics exhibit nonlinear frequency mixing. We describe the data with a theoretical model to high accuracy. For strong excitations we test the experimental data for indications of a chaotic behavior. 
H. Ott, J. Fort\'agh, S. Kraft, A. G\"unther, D. Komma, and C.   Zimmermann