Stuttgart 2012 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 14: Quantengase: Bosonen 2

Q 14.2: Talk

Monday, March 12, 2012, 16:45–17:00, V47.02

Strongly Interacting One-Dimensional Quantum Gases in optical lattices — •Andreas Vogler, Ralf Labouvie, Felix Stubenrauch, Peter Würtz, Vera Guarrera, and Herwig Ott — Fachbereich Physik, Technische Universität Kaiserslautern

This talk addresses the experimental investigation of the spatial density-profiles of few one-dimensional tubes of ultracold bosons.

In our experiment, we are employing a tightly focussed electron-beam, which ionizes atoms of an atomic cloud by electron-impact ionization. The produced ions are then extracted by means of electrostatic optics and detected. This allows us to probe atomic density distributions with high temporal and spatial resolution. Furthermore, the electron-beam is a versatile tool to manipulate the atomic ensemble. It allows for heating or cooling as well as a reduction of the atom-number. These features are employed to prepare a tailored BEC, which is subsequently loaded into a deep two-dimensional blue-detuned optical lattice. This confines the gas into tens of individual one-dimensional quantum-gases with interaction strengths varying from weak (quasi-condensate) to strong (Tonks-Girardeau). By applying an inverse Abel-Transformation, we are able to extract high-precision density-profiles of effective one-dimensional quantum-gases with different interaction-strengths. These profiles allow for a detailed comparison with theory e.g. the exact zero-temperature Lieb-Liniger model as well as the Yang-Yang model for finite temperatures.