Hannover 2010 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 7: Ultra-Cold Atoms: Manipulation and Detection (with Q)
A 7.7: Vortrag
Dienstag, 9. März 2010, 15:30–15:45, A 320
Dissipative manipulation of an ultracold quantum gas — •Andreas Vogler1,2, Peter Würtz1, Tatjana Gericke1, Tobias Weber1,2, Fabian Etzold1, Frank Markert1, and Herwig Ott1,2 — 1Institut für Physik, Johannes-Gutenberg Universität, Mainz — 2Fachbereich Physik, Technische Universität Kaiserslautern
We present an experimental investigation of dissipative effects, affecting a cloud of ultracold Rb-atoms.
In our experiment we ionize atoms of an atomic ensemble by electron-impact ionization, using a tightly focussed electron-beam. The ions are extracted by means of electrostatic optics and subsequently detected. This allows us to probe density distributions with high spatial resolution. Furthermore, the electron-beam is a versatile tool capable of applying particle dissipation on the atomic ensemble. We can vary the atomic losses on individual positions by controlling the dwell time. By choosing the correct scan-pattern we are able to perturb the atomic cloud either on distinct places or homogeneously.
The temporal analysis of the detected ions allows us to determine cross-sections of electron-atom scattering as well as observe signatures of cold ion-atom collisions. We propose this dissipative manipulation technique to study many-body effects, e.g., local and non-local particle-particle correlations.