Collective modes of a Fermi superfluid containing vortices along the BEC-BCS crossover

• Published in: Physical review. A, Atomic, molecular, and optical physics Vol. 73; no. 2
• Main Authors: Ghosh, Tarun Kanti, Machida, Kazushige
• Format: Journal Article
• Language: English
• Published: United States 01-02-2006
• Subjects: BCS THEORY; BOSE-EINSTEIN CONDENSATION; CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; COLLECTIVE MODEL; EXCITATION; FERMI GAS; FERMIONS; HYDRODYNAMICS; ROTATION; SPECTRA; SUPERFLUIDITY; TRAPS; VELOCITY; VORTICES
• ISSN: 1050-2947; 1094-1622
• DOI: 10.1103/PhysRevA.73.025601

Using the coarse-grain averaged hydrodynamic approach, we calculate all low energy transverse excitation spectrum of a rotating Fermi superfluid containing vortex lattices for all regimes along the Bose-Einstein condensate-Bardeen-Cooper-Schrieffer (BEC-BCS) crossover. In the fast rotating regime, the molecular BEC enters into the lowest Landau level, but the superfluid in the unitarity and the BCS regimes occupies many low-lying Landau levels. The difference between the breathing mode frequencies at the BEC and unitarity limit shrinks to zero as the rotation speed approaches the radial trap frequency, in contrast to the finite difference in the nonrotating systems.