Pairing gap and in-gap excitations in trapped fermionic superfluids |
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Authors: | Kinnunen J Rodríguez M Törmä P |
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Institution: | Department of Physics, NanoScience Center, Post Office Box 35, FIN-40014, University of Jyv?skyl?, Finland. |
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Abstract: | 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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