Düsseldorf 2007 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 64: Poster Quantengase

Q 64.23: Poster

Donnerstag, 22. März 2007, 16:30–18:30, Poster C

Bose-Einstein Condensates in superconducting Nb microtraps — •Daniel Cano, Brian Kasch, Matthias Kemmler, Michael Gierling, Dieter Kölle, Reinhold Kleiner, Claus Zimmermann, and József Fortágh — Physikalisches Institut der Universität Tübingen

This poster shows technical and theoretical aspects of a new experiment that aims to realize Bose-Einstein condensation (BEC) in superconducting microtraps.

A cloud of 87-Rb atoms will be evaporatively cooled in a magnetic trap until a BEC is formed. Subsequently, the condensate will be transferred by means of optical tweezers into a magnetic micro-trap generated on a Niobium chip at 4,2 K.

Magnetic fields in the vicinity of superconducting surfaces have been simulated. Inhomogeneous current densities within the superconductor have been calculated using an energy-minimization procedure that relies on the London equations.

Superconducting chips have been produced by means of optical lithography and a lift-off technique. Different magnetic-field configurations as well as possible trap geometries are depicted. The measured electronic properties of the fabricated chips are shown together with the current stage of the experiment.