Spin-dipole mode in a trapped Fermi gas near unitarity

Year: 2020

Authors: Tajima H., Recati A., Ohashi Y.

Autors Affiliation: RIKEN, Quantum Hadron Phys Lab, Nishina Ctr RNC, Wako, Saitama 3510198, Japan;‎ Univ Trento, INO CNR BEC Ctr, I-38123 Povo, Italy;‎ Univ Trento, Dipartimento Fis, I-38123 Povo, Italy;‎ Ist Nazl Fis Nucl, Trento Inst Fundamental Phys & Applicat, I-38123 Trento, Italy; Keio Univ, Dept Phys, Kohoku Ku, Yokohama, Kanagawa 2238522, Japan

Abstract: We theoretically investigate the spin-dipole oscillation of a strongly interacting Fermi gas confined by a harmonic trapping potential. By using a diagrammatic strong-coupling theory combined with a local density approximation and a sum rule approach, we study the temperature dependence of the spin-dipole frequency near unitarity. The connection of the spin-dipole frequency with the spin susceptibility and the pairing correlations is exploited. While the spin-dipole frequency exactly coincides with the trap frequency in a noninteracting Fermi gas, it is shown to be strongly enhanced in the superfluid state, because of the suppression of the spin degree of freedom due to the spin-singlet Cooper-pair formation. In strongly interacting Fermi gases, such enhancement occurs even above the superfluid phase transition temperature, due to the strong pairing correlations.

Journal/Review: PHYSICAL REVIEW A

Volume: 101 (1)      Pages from: 013610-1  to: 013610-7

KeyWords: THERMODYNAMICS; OSCILLATIONS; RESONANCES; BEHAVIOR
DOI: 10.1103/PhysRevA.101.013610

Citations: 2
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