Stuttgart 2012 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

Q: Fachverband Quantenoptik und Photonik

Q 51: Ultra-cold atoms, ions and BEC III

Q 51.6: Vortrag

Donnerstag, 15. März 2012, 15:15–15:30, V47.02

Sympathetic cooling of ions to ultralow energies — •Artjom Krükow, Andreas Brunner, Arne Härter, Stefan Schmid, Wolfgang Schnitzler, and Johannes Hecker Denschlag — Institut für Quantenmaterie, Universität Ulm, Albert-Einstein Allee 45, 89081 Ulm, Germany

We investigate the interaction of a laser-cooled trapped ion (138Ba+ or 87Rb+) with an ultracold cloud of optically confined 87Rb atoms. The ion is held in a linear Paul trap and is immersed in the center of the cold atomic cloud. The atom-ion interaction gives rise to a long range attractive 1/r4 polarization potential. Charge transfer processes and elastic scattering were observed at millikelvin collision energies [1,2]. The collision energy scale is given by the effect of stray electric fields on ions in a dynamic Paul trap, namely causing ion micromotion [3]. Using field compensation techniques, we achieve sympathetic cooling of the ion to Ba+ sub-Doppler temperatures (<300 µK) and examine the influence of ion micromotion energy over a wide range. By decreasing the ion temperatures even further we are aiming at novel experiments, such as the creation of mesoscopic atom-ion bound states [4] or the production of ultracold, charged molecules in a well-defined quantum state.

[1] S. Schmid et al, Phys. Rev. Lett. 105, 133202 (2010)

[2] C. Zipkes et al, Phys. Rev. Lett. 105, 133201 (2010)

[3] D. Berkeland et al, J. Appl. Phys. 83, 10 (1998)

[4] R. Côté et al., Phys. Rev. Lett. 89, 093001 (2002)

100% | Mobil-Ansicht | English Version | Kontakt/Impressum/Datenschutz
DPG-Physik > DPG-Verhandlungen > 2012 > Stuttgart