Resonance superfluidity in a quantum degenerate Fermi gas

S.J.J.M.F. Kokkelmans, M. Holland, R. Walser, M. Chiofalo

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

We consider the superfluid phase transition that arises when a Feshbach resonance pairing occurs in a dilute Fermi gas. This is related to the phenomenon of superconductivity described by the seminal Bardeen-Cooper- Schrieffer theory. In superconductivity, the phase transition is caused by a coupling between pairs of electrons within the medium. This coupling is perturbative and leads to a critical temperature Tc which is small compared to the Fermi temperature TF. Even high-Tc superconductors typically have a critical temperature which is two orders of magnitude below TF. Here we describe a resonance pairing mechanism in a quantum degenerate gas of potassium (40K) atoms which leads to superfluidity in a novel regime -- a regime that promises the unique opportunity to experimentally study the cross-over from the Bardeen- Cooper-Schrieffer phase of weakly-coupled fermions to the Bose-Einstein condensate of strongly-bound composite bosons. We find that the transition to a superfluid phase is possible at the high critical temperature of about 0.5 TF. It should be straightforward to verify this prediction, since these temperatures can already be achieved experimentally.
Original languageEnglish
Pages (from-to)387-397
Number of pages11
JournalActa Physica Polonica A
Volume101
Issue number03
DOIs
Publication statusPublished - 1 Jun 1999
Externally publishedYes

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