E. Nicklas, T. Zibold, H. Strobel, W. Müssel, M. Höfer, M.K. Oberthaler
Kirchhoff Institut für Physik, University Heidelberg, 69120 Heidelberg, Germany

We report on our recent experimental results obtained in the context of bosonic internal Josephson junctions which allow for the realization of a classical bifurcation scenario. The classical [1] as well as the quantum dynamics is experimentally investigated in the situation of a single external mode and the results are in good agreement with the theoretical expectations. By adding external degrees of freedom a situation can be reached where the dynamics in a quench through the associated quantum phase transition can be studied [2]. We will present our latest results on scaling of the excitations generated by quenching through a critical point with different speeds and compare with the expectation given by the Kibbel Zurek mechanism.

[1] Zibold, Tilman, Eike Nicklas, Christian Gross, und Markus Oberthaler.
“Classical Bifurcation at the Transition from Rabi to Josephson Dynamics“.
Physical Review Letters 105, 204101 (2010).

[2] Jacopo Sabbatini, Wojciech H. Zurek, and Matthew J. Davis “Phase Separation and Pattern Formation in a Binary Bose-Einstein Condensate”, Physical Review Letters 107, 230402 (2011)