Cooper pairing in ultracold 40K using Feshbach resonances
John L. Bohn
DOI 10.1103/PhysRevA.61.053409 · Physical Review A
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Abstract
We point out that the fermionic isotope 40K is a likely candidate for the formation of Cooper pairs in an ultracold atomic gas. Specifically, in an optical trap that simultaneously traps the spin states |9/2,−9/2〉 and |9/2,−7/2〉, there exists a broad magnetic-field Feshbach resonance at B=196−21+9 G that can provide the required strong attractive interaction between atoms. An additional resonance, at B=19110+5 G, could generate p-wave pairing between identical |9/2,−7/2〉 atoms. A Cooper-paired degenerate Fermi gas could thus be constructed with existing ultracold-atom technology.
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