FYI (First appeared on arXiv in May, 2017):

"The nature of the normal phase of strongly correlated fermionic systems is an 
outstanding question in quantum many-body physics. We use spatially resolved 
radio-frequency spectroscopy to measure pairing energy of fermions across a 
wide range of temperatures and interaction strengths in a two-dimensional gas 
of ultracold fermionic atoms. We observe many-body pairing at temperatures far 
above the critical temperature for superfluidity. In the strongly interacting 
regime, the pairing energy in the normal phase significantly exceeds the 
intrinsic two-body binding energy of the system and shows a clear dependence on 
local density. This implies that pairing in this regime is driven by many-body 
correlations, rather than two-body physics. Our findings show that pairing 
correlations in strongly interacting two-dimensional fermionic systems are 
remarkably robust against thermal fluctuations."

Some excerpts from/following above links:

"We perform our experiments with a two-component mixture of 6Li atoms with 
approximately 3 × 104 particles per spin state that are loaded into a single 
layer of an anisotropic harmonic optical trap."

"Using a technique known as radio-frequency spectroscopy, the researchers 
measured the response of the atoms to a radio-wave pulse. From this response, 
they could tell exactly whether or not the particles were paired and in what 

"Beyond this previously explored regime, our measurements reveal that many-body 
effects enhance the pairing energy far above the critical temperature, with the 
maximum enhancement occurring at ln(kFa2D) ≈ 1, where a reliable mean-field 
description is not available."

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