Collisional properties of ultracold K-Rb mixtures

Year: 2002

Authors: Ferrari G., Inguscio M., Jastrzebski W., Modugno G., Roati G., Simoni A.

Autors Affiliation: European Laboratory for Nonlinear Spectroscopy and Dipartimento di Fisica, Universita di Firenze, and INFM, 50019 Sesto Fiorentino, Italy; INFM and Dipartimento di Chimica, Universita di Perugia, 06123 Perugia, Italy

Abstract: We determine the interspecies s-wave triplet scattering length a(3) for all K-Rb isotopic mixtures by measuring the elastic cross section for collisions between K-41 and Rb-87 in different temperature regimes. The positive value a(3)=+163(-12)(+57)a(0) ensures the stability against collapse of binary K-41- Rb-87 Bose-Einstein condensates. For the fermion-boson mixture K-40- Rb-87, we obtain a large and negative scattering length which implies an efficient sympathetic cooling of the fermionic species down to the degenerate regime.

Journal/Review: PHYSICAL REVIEW LETTERS

Volume: 89 (5)      Pages from: 053202-1  to: 053202-4

KeyWords: cold collisions; potassium; rubudium; bec Fermi mixtures;
DOI: 10.1103/PhysRevLett.89.053202

Citations: 128
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