Collisional properties of ultracold K-Rb mixtures

Details Collisional properties of ultracold K-Rb mixtures Collisional properties of ultracold K-Rb mixtures

2002-02-18

arxiv.org/abs/cond-mat/0202290v2

Phys. Rev. Lett. 89, 053202 (2002)

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 4 figures; revised version (references added and small changes)

Scientific paper

10.1103/PhysRevLett.89.053202

We determine the inter-species s-wave triplet scattering length a3 for all K-Rb isotopic mixtures by measuring the cross-section for collisions between 41K and 87Rb in different temperature regimes. The positive value a3=+163(+57,-12)a0 ensures the stability 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.

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