Bose-Bose mixtures in reduced dimensions

Year: 2011

Authors: Minardi F., Barontini G., Catani J., Lamporesi G., Nishida Y., Inguscio M.

Autors Affiliation: LENS and Università di Firenze, Via Nello Carrara 1, 50019 Sesto Fiorentino, Italy CNR – Istituto Nazionale di Ottica, Via Giovanni Sansone 1, 50019 Sesto Fiorentino, Italy; Center for Theoretical Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA

Abstract: The two-body scattering is greatly modified in reduced dimensions. With ultracold atoms, low dimensional configurations are routinely accessible thanks to the use of optical lattices which allow confinements sufficiently strong to freeze the motion along chosen directions. With two different atomic species, we use a species-selective optical potential, in the form of a standing wave, to confine only one species in 2D disks and study the scattering between particles existing in different dimensions, i.e., we realize a 2D-3D mix-dimensional configuration, reminiscent of a brane world. We review the scattering theory specific to this configuration and derive an effective scattering length aeff in terms of the free-space scattering length a and the confinement parameters. We detect experimentally the enhancement of inelastic collisions arising at particular values of a and relate these values to the divergences of aeff. Unlike the confinement-induced resonances predicted and observed for identical particles, our mixed-dimensional resonances occur in a series of several resonances, because the relative and centre-of-mass motion are coupled.

Conference title:

KeyWords: Atoms; Crystal lattices; Optical lattices; Particle optics; Resonance, Confinement-induced resonances; Free space scattering; Identical particles; Inelastic collision; Optical potential; Scattering length; Scattering theory; Two-body scattering, Atomic physics
DOI: 10.1088/1742-6596/264/1/012016

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