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Q: Fachverband Quantenoptik und Photonik

Q 30: Poster II

Q 30.3: Poster

Dienstag, 3. März 2009, 16:30–19:00, VMP 9 Poster

Phase fluctuations in one-dimensional quasi-condensates on an atom chip — •Thomas Betz, Robert Bücker, Christian Koller, Stephanie Manz, Wolfgang Rohringer, Aurélien Perrin, Thorsten Schumm, and Jörg Schmiedmayer — Atominstitut - Technische Universität Wien, Stadionallee 2, A-1020 Vienna, Österreich

The intrinsic elongated geometry of wire traps on an atom chip provides direct access to ultra-cold one-dimensional systems. In contrast to the three-dimensional case, one- dimensional ultra-cold Bose gases do not exhibit long-range order. The respective phase fluctuations are observed in interference experiments with split one-dimensional Bose-Einstein condensates, using radio-frequency induced double well potentials [1,2], or by directly observing density modulations in time-of-flight images [3]. Studying the spectrum of these modulations after a ballistic expansion of the atomic cloud allows to compare our system to the predictions of theory.

[1] T. Schumm et al., Nature Phys. 1, 57 (2005) [2] G.-B. Jo et al., PRL 99, 240406 (2007) [3] D. Hellweg et al., Appl. Phys. B 73 781 (2001)