Observation of Heteronuclear Atomic Efimov Resonances

Year: 2009

Authors: Barontini G., Weber C., Rabatti F., Catani J., Thalhammer G., Inguscio M., Minardi F.

Autors Affiliation: LENS, European Laboratory for Non-Linear Spectroscopy and Dipartimento di Fisica, Universita di Firenze, via Nello Carrara 1, I-50019 Sesto Fiorentino, Firenze, Italy;
Institut fur Angewandte Physik, Universitat Bonn, Wegelerstraße 8, D-53115 Bonn, Germany;
CNR-INFM, via G. Sansone 1, I-50019 Sesto Fiorentino, Firenze, Italy

Abstract: Building on the recent experimental observation with ultracold atoms, we report the first experimental evidence of Efimov physics in a heteronuclear system. A mixture of (41)K and (87)Rb atoms was cooled to few hundred nanokelvins and stored in an optical dipole trap. Exploiting a broad interspecies Feshbach resonance, the losses due to three-body collisions were studied as a function of the interspecies scattering length. We observe an enhancement of the three-body collisions for three distinct values of the interspecies scattering lengths, both positive and negative, where no Feshbach resonances are expected. We attribute the two features at negative scattering length to the existence of two kinds of Efimov trimers, KKRb and KRbRb.

Journal/Review: PHYSICAL REVIEW LETTERS

Volume: 103 (4)      Pages from: 043201  to: 043201

KeyWords: Efimov trimers; Experimental evidence; Experimental observation; Feshbach resonances; Heteronuclear; Heteronuclear systems; Negative scattering length; Optical dipole traps; Scattering length; Three-body collisions; Ultracold atoms, Resonance; Rubidium; Scattering, Atoms
DOI: 10.1103/PhysRevLett.103.043201

Citations: 186
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