Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2004-05-18
Phys. Rev. A 70, 021601 (2004)
Physics
Condensed Matter
Soft Condensed Matter
RevTeX4 + 4 eps figures; Replaced with published version
Scientific paper
10.1103/PhysRevA.70.021601
A quantum degenerate, dilute gas mixture of bosonic and fermionic atoms was produced using 87Rb and 40K. The onset of degeneracy was confirmed by observing the spatial distribution of the gases after time-of-flight expansion. Further, the magnitude of the interspecies scattering length between the doubly spin polarized states of 87Rb and 40K, |a_RbK|, was determined from cross-dimensional thermal relaxation. The uncertainty in this collision measurement was greatly reduced by taking the ratio of interspecies and intraspecies relaxation rates, yielding |a_RbK| = 250 +/- 30 a_0, which is a lower value than what was reported in [M. Modugno et al., Phys. Rev. A 68, 043626 (2003)]. Using the value for |a_RbK| reported here, current T=0 theory would predict a threshold for mechanical instability that is inconsistent with the experimentally observed onset for sudden loss of fermions in [G. Modugno et al., Science 297, 2240 (2002)].
DePaola B. D.
Goldwin J.
Inouye Shin
Jin Deborah S.
Newman B. B.
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