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2005

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Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/9577

Microscopic description of the twist mode in normal and superfluid trapped Fermi gases

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http://dx.doi.org/10.1103/PhysRevA.71.013603

Abstract

We investigate the "twist" mode (rotation of the upper against the lower hemisphere) of a dilute atomic Fermi gas in a spherical trap. The normal and superfluid phases are considered. The linear response to this external perturbation is calculated within the microscopic Hartree-Fock-Bogoliubov approach. In the normal phase the excitation spectrum is concentrated in a rather narrow peak very close to the trapping frequency. In the superfluid phase the strength starts to be damped and fragmented and the collectivity of the mode is progressively lost when the temperature decreases. In the weak-pairing regime some reminiscence of the collective motion still exists, whereas in the strong-pairing regime the twist mode is completely washed out. The disappearance of the twist mode in the strong-pairing regime with decreasing temperature is interpreted in the framework of the two-fluid model.

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Matèria condensada, Estructura nuclear, Models nuclears, Gas d'electrons, Teoria de l'aproximació

Subject (English)

Condensed matter, Nuclear structure, Nuclear models, Electron gas, Approximation theory

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Articles publicats en revistes (Física Quàntica i Astrofísica)

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GRASSO, Marcella, URBAN, Michael and VIÑAS GAUSÍ, Xavier. Microscopic description of the twist mode in normal and superfluid trapped Fermi gases. Physical Review A. 2005. Vol. 71, num. 1, pags. 013603. ISSN 1050-2947. [consulted: 6 of June of 2026]. Available at: https://hdl.handle.net/2445/9577

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