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APS » Phys. Rev. Lett. » Volume 97 » Issue 12

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Phys. Rev. Lett. 97, 120403 (2006) [4 pages]

Tuning of Heteronuclear Interactions in a Degenerate Fermi-Bose Mixture

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S. Ospelkaus, C. Ospelkaus, L. Humbert, K. Sengstock, and K. Bongs
Institut für Laserphysik, Luruper Chaussee 149, 22761 Hamburg, Germany

Received 3 July 2006; published 18 September 2006

Wedemonstrate tuning of interactions between fermionic ⁴⁰K and bosonic ⁸⁷Rbatoms by Feshbach resonances and access the complete phase diagramof the harmonically trapped mixture from phase separation to collapse.On the attractive side of the resonance, we observe astrongly enhanced mean-field energy of the condensate due to themutual mean-field confinement, predicted by a Thomas-Fermi model. As weincrease heteronuclear interactions beyond a threshold, we observe an inducedcollapse of the mixture. On the repulsive side of theresonance, we observe vertical phase separation of the mixture inthe presence of the gravitational force, thus entering a completelyunexplored part of the phase diagram of the mixture. Inaddition, we identify the 515 G resonance as p wave byits characteristic doublet structure.

©2006 The American Physical Society

URL:	http://link.aps.org/doi/10.1103/PhysRevLett.97.120403
DOI:	10.1103/PhysRevLett.97.120403
PACS:	03.75.Kk; 03.75.Ss; 32.80.Pj; 34.20.Cf 03.75.Kk Dynamic properties of Bose-Einstein condensates; collective and hydrodynamic excitations, superfluid flow 03.75.Ss Degenerate Fermi gases 32.80.Pj Optical cooling of atoms; trapping 34.20.Cf Interatomic potentials and forces YEAR: 2006

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