Hannover 2010 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 38: Quantum Gases: Bosons III / Lattices I

Q 38.7: Talk

Wednesday, March 10, 2010, 18:00–18:15, E 001

Confinement-induced resonances in 1D quantum systems — •Elmar Haller, Manfred J. Mark, Johann G. Danzl, Russell Hart, Lukas Reichsöllner, Andreas Klinger, Oliver Krieglsteiner, and Hanns-Christoph Nägerl — Institut für Experimentalphysik und Zentrum für Quantenphysik, Universität Innsbruck, Technikerstraße 25, A-6020 Innsbruck, Austria

Strong external potentials can be employed to confine atoms to one-dimensional (1D) and two-dimensional (2D) spatial geometry. For a 1D system with strong repulsive interaction, a dramatic change of the atomic scattering properties is predicted as the s-wave scattering length approaches the transversal confinement length [1]. We report on the observation of such a confinement-induced resonance (CIR) in a degenerate gas of Cs atoms in a 2D optical lattice. The versatility of a confinement-controlled interaction strength is demonstrated by creating a double resonance with a transversally asymmetric wave guide. We observe a splitting of the CIR and the occurrence of additional scattering resonances. One possible application of a CIR is the creation of a “super Tonks Girardeau gas”, which is an excited, strongly-correlated gas phase with strong attractive interaction [2,3].

[1] M. Olshanii, Phys. Rev. Lett. 81, 938-941 (1998).

[2] E. Haller, et. al., Science 325, 1224 (2009).

[3] E. Astrakharchik, et. al., Phys. Rev. Lett. 95, 190407 (2005).