Rostock 2019 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 63: Ultracold Atoms (Trapping and Cooling)

Q 63.5: Talk

Friday, March 15, 2019, 11:30–11:45, S SR 211 Maschb.

Harmonizing the Magnetic Trap Oscillator — •Bastian Zapf and Reinhold Walser — Institut für Angewandte Physik, Technische Universität Darmstadt, Hochschulstr. 4a, 64289 Darmstadt

Experiments with Bose-Einstein condensates in space [1] use microelectronic chips to provide magnetic trapping fields. These so-called atom chips [2] consist of lithographically printed planar wire structures, with modern chips containing up to a few hundred individually controllable current-carrying wires. Since there are no free currents in the trapping region, the field can locally be derived from a scalar potential which is conveniently expanded into multipoles [3]. This yields a compact description of the magnetic field, suitable for straightforward communication with experimenters and highly useful for efficient computation. We discuss ways to characterize and control the anharmonicity of trapping potentials.

[1] D. Becker et. al., Space-borne Bose-Einstein condensation for precision interferometry, Nature, 562 391 (2018).

[2] J. Reichel and V. Vuletic, Atom Chips, Wiley-VCH (2011).

[3] T. Bergeman et. al., Magnetostatic trapping fields for neutral atoms, Phys. Rev. A, 35 1536 (1987).