München 2004 – wissenschaftliches Programm

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Q: Quantenoptik und Photonik

Q 21: Poster Quantengase

Q 21.9: Poster

Dienstag, 23. März 2004, 14:00–16:00, Schellingstr. 3

Precision real-time evolution of a freely falling BEC — •Gerrit Nandi, Reinhold Walser, and Wolfgang P. Schleich — Abteilung für Quantenphysik, Universität Ulm, Germany

Free falling Bose-Einstein condensates (BEC) that are only subject to micro-gravity provide a new experimental setup to study the non-classical nature of a condensed quantum system. The long-time unconstraint expansion of an ultra-cold Bose gas magnifies sub-healing length physics and allows for a measurement of the macroscopic wave function and its higher correlations [1]. Exact symmetries of the system such as the generalized harmonic potential theorem [2] or the breathing mode [3] can be studied in un-precedented detail.

The detailed description of the freely falling condensate depends on the particular launch procedure and geometry. This requires the numerical solution of the coupled Gross-Pitaevskii equation for the semi-classical field amplitude, the background density and the pair correlation function in real time[4].

[1] D. Helleweg, L. Cacciapuoti, M. Kottke, T. Schulte, K. Sengstock, W. Ertmer, and J. Arlt, Phys. Rev. Lett. 91, 010406 (2003)

[2] J. Dobson Phys. Rev. Lett. 73, 2244-2247 (1994)

[3] L.Pitaevskii and A. Rosch Phys. Rev. A 55 , R853-R856 (1997)

[4] R.Walser, J. Cooper, and M. Holland, Phys. Rev. A 63, 13607 (2001)