Phys. Rev. Lett. 93, 110406 (2004) [4 pages]Pairing Fluctuations in Trapped Fermi GasesReceived 25 February 2004; published 10 September 2004 We examine the contribution of pairing fluctuations to the superfluid order parameter for harmonically trapped atomic Fermi gases in the BCS regime. In the limit of small systems we consider, both analytically and numerically, their space and temperature dependence. We predict a parity effect, i.e., that pairing fluctuations show a maximum or a minimum at the center of the trap, depending on the value of the last occupied shell being even or odd. We propose to detect pairing fluctuations by measuring the density-density correlation function after a ballistic expansion of the gas. © 2004 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.93.110406
DOI:
10.1103/PhysRevLett.93.110406
PACS:
03.75.Ss, 74.40.+k
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