Berlin 2014 – scientific programme

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A: Fachverband Atomphysik

A 56: Ultracold atoms and molecules II (with Q)

A 56.3: Talk

Friday, March 21, 2014, 14:30–14:45, DO26 208

Continuous loading of a mesoscopic atom chip — •Ilka Geisel, Jan Mahnke, Andreas Hüper, Wolfgang Ertmer, and Carsten Klempt — Institut für Quantenoptik, Leibniz Universität Hannover

While microscopic atom chips enhance cooling rates significantly, they typically suffer from smaller atomic ensembles. Our aim is to combine the advantages of atom chips with those of conventional BEC experiments by using a mesoscopic wire structure to provide the magnetic fields for magneto-optical and magnetic trapping.

This structure consists of millimeter-scale wires and is used to create a quadrupole field for a magneto-optical trap [1] and a flexible magnetic trapping potential, connected by a magnetic guide. The magnetic trapping region is shielded from the magneto-optical trap and thus provides better vacuum conditions and perfect stray light protection.

We investigate continuous loading mechanisms of a magnetic trap [2]. We demonstrate the production of a continuously replenished ultracold atomic cloud. Due to continuous evaporation, the cloud has an increasing number of atoms and a decreasing temperature until reaching a final equilibrium.

[1] S. Jöllenbeck, Phys. Rev. A 83, 043406 (2011)

[2] C. F. Roos, Europhys. Lett. 61, 187 (2003)