Fermi excitations in a trapped atomic Fermi gas with a molecular Bose condensate

2004/02/02 by Yoji Ohashi, Ohashi, Y., Allan Griffin +1
Physics and Astronomy · #Advanced Chemical Physics Studies #Cold Atom Physics and Bose-Einstein Condensates #FOS: Physical sciences #Materials Science (cond-mat.mtrl-sci) #Physics of Superconductivity and Magnetism #Soft Condensed Matter (cond-mat.soft) #Statistical Mechanics (cond-mat.stat-mech) #Superconductivity (cond-mat.supr-con)

paper · pdf · doi:10.48550/arxiv.cond-mat/0402031

openalex publication_date 2004/02/02 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

We discuss the effect of a molecular Bose condensate on the energy of Fermi excitations in a trapped two-component atomic Fermi gas. The single-particle Green's functions can be approximated by the well-known BCS form, in both the BCS (Cooper pairs) and BEC (Feshbach resonance molecules) domains. The composite Bose order parameter Δ describing bound states of two atoms and the Fermi chemical potential μ are calculated self-consistently. In the BEC regime characterized by μ<0, the Fermi quasiparticle energy gap is given by √μ²+ Δ², instead of | Δ| in the BCS region, where μ>0. This shows up in the characteristic energy of atoms from dissociated molecules.

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