Competition between final-state and pairing-gap effects in the radio-frequency spectra of ultracold Fermi atoms

Details Competition between final-state and pairing-gap effects in the radio-frequency spectra of ultracold Fermi atoms Competition between final-state and pairing-gap effects in the radio-frequency spectra of ultracold Fermi atoms

2007-09-06

arxiv.org/abs/0709.0817v2

Phys. Rev. Lett. 100, 010402 (2008)

Physics

Condensed Matter

Superconductivity

4 pages, 3 figures, final version published in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.100.010402

The radio-frequency spectra of ultracold Fermi atoms are calculated by including final-state interactions affecting the excited level of the transition, and compared with the experimental data. A competition is revealed between pairing-gap effects which tend to push the oscillator strength toward high frequencies away from threshold, and final-state effects which tend instead to pull the oscillator strength toward threshold. As a result of this competition, the position of the peak of the spectra cannot be simply related to the value of the pairing gap, whose extraction thus requires support from theoretical calculations.

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