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

Abstract

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.

5 pages, 3 figures, 1 table

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• Superfluidity of spin-polarized 6Li
• Exploring a quantum degenerate gas of fermionic atoms
• Inhibition of spontaneous emission in Fermi gases

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