Observation of Heteronuclear Feshbach Resonances in a Mixture of Bosons and Fermions

S. Inouye, J. Goldwin, M. L. Olsen, C. Ticknor, J. L. Bohn, and D. S. Jin

Phys. Rev. Lett. 93, 183201 – Published 25 October 2004

Abstract

Three magnetic-field induced heteronuclear Feshbach resonances were identified in collisions between bosonic ${}^{87}{R b}$ and fermionic ${}^{40}K$ atoms in their absolute ground states. Strong inelastic loss from an optically trapped mixture was observed at the resonance positions of 492, 512, and $543 \pm 2 G$ . The magnetic-field locations of these resonances place a tight constraint on the triplet and singlet cross-species scattering lengths, yielding $(- 281 \pm 15) a_{0}$ and $(- 54 \pm 12) a_{0}$ , respectively. The width of the loss feature at 543 G is $3.7 \pm 1.5 G$ wide; this broad Feshbach resonance should enable experimental control of the interspecies interactions.

Received 9 June 2004

DOI:https://doi.org/10.1103/PhysRevLett.93.183201

Authors & Affiliations

S. Inouye^*, J. Goldwin, M. L. Olsen, C. Ticknor, J. L. Bohn, and D. S. Jin^†

JILA, National Institute of Standards and Technology and University of Colorado, Boulder, Colorado 80309, USA

^*Present address: Department of Physics, University of California, Berkeley, CA 94720, USA.
^†Also at Quantum Physics Division, National Institute of Standards and Technology.

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Vol. 93, Iss. 18 — 29 October 2004

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