Confinement-induced resonances in low-dimensional quantum systems

Haller, Elmar and Mark, Manfred J. and Hart, Russell and Danzl, Johann G. and Reichsöllner, Lukas and Melezhik, Vladimir and Schmelcher, Peter and Nägerl, Hanns-Christoph (2010) Confinement-induced resonances in low-dimensional quantum systems. Physical Review Letters, 104 (15). 153203. ISSN 1079-7114 (

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We report on the observation of confinement-induced resonances in strongly interacting quantum-gas systems with tunable interactions for one-and two-dimensional geometry. Atom-atom scattering is substantially modified when the s-wave scattering length approaches the length scale associated with the tight transversal confinement, leading to characteristic loss and heating signatures. Upon introducing an anisotropy for the transversal confinement we observe a splitting of the confinement-induced resonance. With increasing anisotropy additional resonances appear. In the limit of a two-dimensional system we find that one resonance persists.