Hannover 2013 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 46: Ultra-cold plasmas and Rydberg systems (with Q)

A 46.6: Vortrag

Freitag, 22. März 2013, 12:15–12:30, F 428

Coherent molecule formation in anharmonic waveguides due to inelastic confinement-induced resonances — •Simon Sala1, Gerhard Zürn2, Thomas Lompe2, Andre N. Wenz2, Simon Murmann2, Friedhelm Serwane2, Selim Jochim2, and Alejandro Saenz11AG Moderne Optik, Institut für Physik, Humboldt-Universität zu Berlin, Newtonstrasse 15, 12489 Berlin, Germany — 2Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Germany

Ultracold atomic systems of reduced dimensionality show intriguing phenomena like fermionization of bosons in the Tonks-Girardeau gas or confinement-induced resonances (CIR). The latter allow for a manipulation of the effective 1D interaction strength in a 3D system of large anisotropy. It was proposed [1] that inelastic CIR, which originate from a coupling of center-of-mass and relative motion due an anharmonicity of the trapping potential, lead to losses in a recent experiment. However, also other mechanism were proposed to explain the losses. Here, it is demonstrated that the coupling of center-of-mass and relative motion leads to a coherent coupling of a state of an unbound atom pair and a molecule in agreement with the theory predicting inelastic CIR. Performing an experiment with exactly two particles allows for a direct observation of molecules under exclusion of three-body losses. Moreover, it is shown that molecule formation is absent at an elastic CIR. This has consequences for the interpretation of loss experiments in low dimensional systems.

[1] S. Sala et al., Phys. Rev. Lett. 109, 073201 (2012).

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