Hannover 2003 – wissenschaftliches Programm

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Q: Quantenoptik

Q 8: Quantengase 1

Q 8.3: Vortrag

Montag, 24. März 2003, 14:30–14:45, F303

Formation of Bose-Einstein condensates into excited states — •Wolf von Klitzing, Igor Shvarchuck, Christian Buggle, Dima S. Petrov, Mark Kemmann, Tobias G. Tiecke, Kai Dieckmann, Martin Zielonkowski, Gora V. Shlyapnikov, and Jook T.M. Walraven — FOM-AMOLF, Kruislaan 407, 1098 SJ Amsterdam, Niederlande

We observed the formation of Bose-Einstein condensates into non-equilibrium states [1]. Our condensates are oversized as compared to equilibrium condensates and show the dynamical evolution of the quadrupole shape oscillation of regular condensates. These condensates emerge in elongated traps as the result of local thermalisation when the nucleation time is short compared to the axial oscillation time. The concept of local thermalisation arises because our thermal atomic clouds are prepared far deeper into the hydrodynamic regime as compared to previous experiments on condensate formation [2,3]. Rapid formation causes phase fluctuations which manifest themselves as stripes in the ballistic expansion picture as also observed in [4]. We introduce condensate focusing as a powerful novel method to analyse the properties of these exotic Bose-Einstein condensed gases.

[1] I. Shvarchuck et al. (cond-mat/0207599, accepted in PRL).

[2] H.-J. Miesner et al. Science 279, 1005 (1998).

[3] M. Köhl et al. Phys. Rev. Let. 88, 80402 (2002).

[4] S. Dettmer etal., Phys. Rev. Let.87, 160406 (2001).