Pairing gap and in-gap excitations in trapped fermionic superfluids

Details Pairing gap and in-gap excitations in trapped fermionic superfluids Pairing gap and in-gap excitations in trapped fermionic superfluids

2004-05-27

arxiv.org/abs/cond-mat/0405633v2

Science (July 22 2004 Science Express 110782)

Physics

Condensed Matter

Superconductivity

Journal version

Scientific paper

10.1126/science.1100782

We consider trapped atomic Fermi gases with Feshbach-resonance enhanced interactions in pseudogap and superfluid temperatures. We calculate the spectrum of RF(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, i.e. in-gap excitations. The results support the conclusion that a superfluid, where pairing is a many-body effect, was observed in recent experiments on RF spectroscopy of the pairing gap.

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