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APS » Journals » Phys. Rev. Lett. » Volume 89 » Issue 5
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Phys. Rev. Lett. 89, 053202 (2002) [4 pages]

Collisional Properties of Ultracold K-Rb Mixtures

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G. Ferrari, M. Inguscio, W. Jastrzebski*, G. Modugno, and G. Roati†
European Laboratory for Nonlinear Spectroscopy and Dipartimento di Fisica, Universitá di Firenze, and INFM, 50019 Sesto Fiorentino, Italy

A. Simoni
INFM and Dipartimento di Chimica, Universitá di Perugia, 06123 Perugia, Italy

Received 18 February 2002; published 15 July 2002

We determine the interspecies s-wave triplet scattering length a3 for all K-Rb isotopic mixtures by measuring the elastic cross section for collisions between 41K and 87Rb in different temperature regimes. The positive value a3=+163-12+57a0 ensures the stability against collapse of binary 41K-87Rb Bose-Einstein condensates. For the fermion-boson mixture 40K-87Rb, we obtain a large and negative scattering length which implies an efficient sympathetic cooling of the fermionic species down to the degenerate regime.

© 2002 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.89.053202
DOI:
10.1103/PhysRevLett.89.053202
PACS:
34.50.Pi, 05.30.Fk, 05.30.Jp, 32.80.Pj

*Also at Institute of Physics, Polish Academy of Science, 02668 Warszawa, Poland.

†Also at Dipartimento di Fisica, Universitá di Trento, 38050 Povo, Italy.

 
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