Pairing Gap and In-Gap Excitations in Trapped Fermionic Superfluids

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Science  20 Aug 2004:
Vol. 305, Issue 5687, pp. 1131-1133
DOI: 10.1126/science.1100782

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We consider trapped atomic Fermi gases with Feshbach-resonance enhanced interactions in pseudogap and superfluid temperatures. We calculate the spectrum of radio-frequency (or laser) excitations for transitions that transfer atoms out of the superfluid state. The spectrum displays the pairing gap and also the contribution of unpaired atoms, that is, in-gap excitations. The results support the conclusion that a superfluid, in which pairing is a manybody effect, was observed in recent experiments on radio-frequency spectroscopy of the pairing gap.

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