Hannover 2016 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 27: Poster: Quantum Optics and Photonics II

Q 27.25: Poster

Dienstag, 1. März 2016, 16:30–19:00, Empore Lichthof

Effects of noncondensed particles in BEC experiments — •Christian Ufrecht, Albert Roura, and Wolfgang Schleich — Institut für Quantenphysik, Universität Ulm, Albert-Einstein-Allee 11, 89081 Ulm

In recent years, matter-wave interferometry with Bose-Einstein condensates as a source of atomic clouds with very narrow momentum distributions has become an important experimental technique. Unfortunately, theoretical models based on the Gross-Pitaevskii equation, which is strictly valid only at T=0 and in the proper thermodynamic limit, do not account for thermal and quantum depletion of the condensate mode. The existence of a cloud of noncondensed particles, however, might for instance affect the contrast in interferometry experiments in a non-negligible way, particularly in dynamical situations. With the help of generalized equations which describe the coupling of condensate and noncondensed cloud, we estimate this effect in situations far from equilibrium, such as the expansion from a suddenly switched-off trap or delta-kick collimation.