Observation of p-wave Threshold Law Using Evaporatively Cooled Fermionic Atoms

Details Observation of p-wave Threshold Law Using Evaporatively Cooled Fermionic Atoms Observation of p-wave Threshold Law Using Evaporatively Cooled Fermionic Atoms

1998-12-22

arxiv.org/abs/cond-mat/9812350v1

Physics

Condensed Matter

5 pages, 3 figures, 1 table

Scientific paper

10.1103/PhysRevLett.82.4208

We have measured independently both s-wave and p-wave cross-dimensional thermalization rates for ultracold potassium-40 atoms held in a magnetic trap. These measurements reveal that this fermionic isotope has a large positive s-wave triplet scattering length in addition to a low temperature p-wave shape resonance. We have observed directly the p-wave threshold law which, combined with the Fermi statistics, dramatically suppresses elastic collision rates at low temperatures. In addition, we present initial evaporative cooling results that make possible these collision measurements and are a precursor to achieving quantum degeneracy in this neutral, low-density Fermi system.

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