Temperature and coupling dependence of the universal contact intensity for an ultracold Fermi gas

Details Temperature and coupling dependence of the universal contact intensity for an ultracold Fermi gas Temperature and coupling dependence of the universal contact intensity for an ultracold Fermi gas

2010-05-07

arxiv.org/abs/1005.1158v2

Phys. Rev. A 82, 021605(R) (2010)

Physics

Condensed Matter

Quantum Gases

5 pages, 5 figures

Scientific paper

10.1103/PhysRevA.82.021605

Physical properties of an ultracold Fermi gas in the temperature-coupling phase diagram can be characterized by the contact intensity C, which enters the pair-correlation function at short distances and describes how the two-body problem merges into its surrounding. We show that the local order established by pairing fluctuations about the critical temperature Tc of the superfluid transition considerably enhances the contact C in a temperature range where pseudogap phenomena are maximal. Our ab initio results for C in a trap compare well with recently available experimental data over a wide coupling range. An analysis is also provided for the effects of trap averaging on C.

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