Single-particle excitations and the order parameter for a trapped superfluid Fermi gas

Abstract

We reveal a strong influence of a superfluid phase transition on the character of single-particle excitations of a trapped neutral-atom Fermi gas. Below the transition temperature the presence of a spatially inhomogeneous order parameter (gap) shifts up the excitation eigenenergies and leads to the appearance of in-gap excitations localized in the outer part of the gas sample. The eigenenergies become sensitive to the gas temperature and are no longer multiples of the trap frequencies. These features should manifest themselves in a strong change of the density oscillations induced by modulations of the trap frequencies and can be used for identifying the superfluid phase transition.

5 pages, RevTeX, 2 eps figures

References in corpus (1)

• Critical temperature and Ginzburg-Landau equation for a trapped Fermi gas

Cited by in corpus (19)

• Direct Imaging of Spatially Modulated Superfluid Phases in Atomic Fermion Systems
• Probing the excitation spectrum of a Fermi gas in the BCS-BEC crossover regime
• Pairing gap and in-gap excitations in trapped fermionic superfluids
• Laser probing of atomic Cooper pairs
• Low energy Collective Modes of a Superfluid Trapped atomic Fermi Gas
• Low energy collective excitations in a superfluid trapped Fermi gas
• Cooper pairing and single particle properties of trapped Fermi gases
• Laser probing of Cooper-paired trapped atoms
• Shell structure and pairing for interacting fermions in a trap
• Pairing of fermions in atomic traps and nuclei
• Imbalanced Superfluid Phase of a Trapped Fermi Gas in the BCS-BEC Crossover Regime
• Vortex Core Structure in Neutral Fermion Superfluids with Population Imbalance
• Diffraction of a superfluid Fermi gas by an atomic grating
• Detection of the BCS transition of a trapped Fermi Gas
• Gradient corrections to the local density approximation for trapped superfluid Fermi gases
• Quasiparticle spectrum and dynamical stability of an atomic Bose-Einstein condensate coupled to a degenerate Fermi gas
• Pairing gaps in atomic gases at the BCS-BEC crossover
• Collisionless collective modes of fermions in magnetic traps
• Pairing correlations of cold fermionic gases at overflow from a narrow to a wide harmonic trap