Phys. Rev. Lett. 80, 2097–2100 (1998)Prospects for Mixed-Isotope Bose-Einstein Condensates in RubidiumReceived 7 July 1997; published in the issue dated 9 March 1998 We calculate binary collision parameters for mixtures of ultracold gases of 85Rb and 87Rb atoms. We predict a large positive triplet scattering length for mixed-isotope collisions, which implies that a stable mixed-isotope double condensate can be formed by sympathetic evaporative cooling. Moreover, collisions between 85Rb and 87Rb atoms in the lowest hyperfine manifold exhibit magnetic-field-induced Feshbach resonances which should allow partial control of the interaction between condensates. These considerations make Rb an ideal system for the study of interpenetrating bosonic superfluids. © 1998 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.80.2097
DOI:
10.1103/PhysRevLett.80.2097
PACS:
34.50.Rk, 32.80.Pj, 33.70.Ca
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