Role of interactions in spin-polarized atomic Fermi gases at unitarity

Year: 2008

Authors: Recati A., Lobo C., Stringari S.

Autors Affiliation: Dipartimento di Fisica, Università di Trento and CNR-INFM BEC Center, I-38050 Povo, Trento, Italy;
School of Physics and Astronomy, University of Nottingham, University Park, Nottingham, NG7 2RD, United Kingdom

Abstract: We study the zero temperature properties of a trapped polarized Fermi gas at unitarity by assuming phase separation between an unpolarized superfluid and a polarized normal phase. The effects of the interaction are accounted for using the formalism of quasiparticles to build up the equation of state of the normal phase with the Monte Carlo results for the relevant parameters. Our predictions for the Chandrasekhar-Clogston limit of critical polarization and for the density profiles, including the density jump at the interface, are confirmed with excellent accuracy by the recent experimental results at MIT. The role of interaction on the radial width of the minority component, on the gap of spectral functions, and on the spin oscillations in the normal phase is also discussed. Our analysis points out the Fermi liquid nature of these strongly interacting spin-polarized configurations.

Journal/Review: PHYSICAL REVIEW A

Volume: 78 (2)      Pages from: 023633  to: 023633

KeyWords: strongly interacting fermions; ultracold trapped gases;
DOI: 10.1103/PhysRevA.78.023633

Citations: 34
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