1305.5015 (Junjun Xu et al.)

Radio frequency spectrum of fermions near a narrow Feshbach resonance    [PDF]

Junjun Xu, Qiang Gu, Erich J. Mueller

We calculate the radio frequency (RF) spectrum of fermions near a narrow Feshbach resonance, explaining observations made in ultracold samples of 6Li [Hazlett, et al., PRL 108, 045304 (2012)]. Using a two channel resonance model, we show that the RF spectrum contains two peaks. In the wide resonance limit, nearly all spectral weight lies in one of these peaks. We find strong temperature dependence which can be traced to the energy dependence of the two-particle scattering. In addition to microscopic calculations, we use sum rule arguments to find generic features of the spectrum which are model independent.

View original: http://arxiv.org/abs/1305.5015