Phys. Rev. A 69, 033601 (2004) [9 pages]Mixed-isotope Bose-Einstein condensates in rubidiumReceived 8 August 2003; revised 13 October 2003; published 3 March 2004 We consider the ground-state properties of mixed Bose-Einstein condensates of 87Rb and 85Rb atoms in the isotropic pancake trap for both signs of the interspecies scattering length. In the case of the repulsive interspecies interaction, there are the axially symmetric and symmetry-breaking ground states. The threshold for the symmetry-breaking transition, which is related to appearance of a zero dipole mode, is found numerically. For attractive interspecies interactions, the two condensates assume symmetric ground states for the numbers of atoms up to the collapse instability of the mixture. © 2004 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.69.033601
DOI:
10.1103/PhysRevA.69.033601
PACS:
03.75.Mn, 03.75.Hh
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