Radio frequency spectroscopy and the pairing gap in trapped Fermi gases

Details Radio frequency spectroscopy and the pairing gap in trapped Fermi gases Radio frequency spectroscopy and the pairing gap in trapped Fermi gases

2005-04-16

arxiv.org/abs/cond-mat/0504394v1

Phys. Rev. A 72, 011602(R) (2005)

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 3 figures included, submitted to PRA(RC)

Scientific paper

10.1103/PhysRevA.72.011602

We present a theoretical interpretation of radio-frequency (RF) pairing gap experiments in trapped atomic Fermi gases, over the entire range of the BCS-BEC crossover, for temperatures above and below $T_c$. Our calculated RF excitation spectra, as well as the density profiles on which they are based, are in semi-quantitative agreement with experiment. We provide a detailed analysis of the physical origin of the two different peak features seen in RF spectra, one associated with nearly free atoms at the edge of the trap, and the other with (quasi-)bound fermion pairs.

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