Tomographic RF Spectroscopy of a Trapped Fermi Gas at Unitarity

Abstract

We present spatially resolved radio-frequency spectroscopy of a trapped Fermi gas with resonant interactions and observe a spectral gap at low temperatures. The spatial distribution of the spectral response of the trapped gas is obtained using in situ phase-contrast imaging and 3D image reconstruction. At the lowest temperature, the homogeneous rf spectrum shows an asymmetric excitation line shape with a peak at 0.48(4)${\epsilon }_F$ with respect to the free atomic line, where ${\epsilon }_F$ is the local Fermi energy.

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