title: Critical rotational frequency for superfluid fermionic gases across a Feshbach resonance.
abstract: We present a method to determine the critical rotational frequencies for superfluidity of both uniform and trapped Fermi gases across a wide Feshbach resonance. It is found that as one approaches the resonance from the BCS side, beyond a critical scattering length, pairing is so robust that superfluidity cannot be destroyed by rotation. Moreover, the critical frequency has a sequence of jumps revealing the appearance of Landau levels, which are particularly prominent for systems up to a few thousand particles. For rotational frequency below an ultimate critical frequency, defined to be the lowest frequency at which the center of the cloud goes normal, a trapped gas has a superfluid core surrounded by a normal gas, as seen in recent experiments (C. H. Schunck, cond-mat/0607298).
authors.affiliation: Physics Department, The Ohio State University, Columbus, Ohio 43210, USA.
authors.forename: Hui
authors.initials: H
authors.lastname: Zhai
authors.forename: Tin-Lun
authors.initials: TL
authors.lastname: Ho