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 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.

4 pages, 2 figures, published version

References in corpus (1)

• Vortices and Superfluidity in a Strongly Interacting Fermi Gas

Cited by in corpus (9)

• Theory of ultracold Fermi gases
• Superfluid Expansion of a Strongly Interacting Fermi Gas
• Pair-Breaking in Rotating Fermi Gases
• Density waves and supersolidity in rapidly rotating atomic Fermi gases
• Destroying superfluidity by rotating a Fermi gas at unitarity
• Breathing modes of a fast rotating Fermi gas
• Vortex formation in a rotating two-component Fermi gas
• Breathing mode frequencies of a rotating Fermi gas in the BCS-BEC crossover region
• Vortex-lattice structures in rotating Bose-Fermi superfluid mixtures