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Q: Fachverband Quantenoptik und Photonik

Q 55: Poster II

Q 55.6: Poster

Donnerstag, 11. März 2010, 16:00–19:00, Lichthof

Single Atom Detection on Atomchips — •Saskia Kühnhold, Barbara Grüner, Michael Gierling, Philipp Schneeweiss, Gabriela Visanescu, Michael Jag, Alexander Stibor, Michael Häffner, Dieter Kern, Andreas Günther, and József Fortágh — Physikalisches Institut, Eberhard Karls Universität Tübingen, Auf der Morgenstelle 14, D-72076 Tübingen

We present two single atom detection schemes for cold atom experiments on atom chips. The first detector is based on multi-photo-ionization of cold atoms and the adjacent ion-counting with a channel electron multiplier [1]. We present measurements on static and dynamic properties of ultracold atom clouds, ranging from temperatures to correlation measurements. The second detector is based on field-ionization of ground state atoms close to tips of positively charged carbon nanotubes (CNTs) and the detection of the produced ion [2]. We characterize the field strength at the CNT tips and determine the ionising area next to the nanotubes. We demonstrate the nanotube detector by counting atoms from a thermal beam of rubidium atoms and show up an application of the detector as a partial pressure gauge.

[1] Günther et al., Phys. Rev. A 80, 011604(R) (2009) [2] Grüner et al., arXiv:0911.1329 (2009), Phys. Rev. A in print