Collective excitations of a trapped Fermi gas at finite temperature

A. Korolyuk, J. J. Kinnunen, and P. Törmä

Phys. Rev. A 89, 013602 – Published 6 January 2014

Abstract

We study collective excitations of a trapped Fermi gas at finite temperature using the Bogoliubov–de Gennes mean-field theory in conjunction with the generalized random-phase approximation. The collective excitations are analyzed through the density response of a monopole excitation. We show the appearance of several modes at the normal-fluid–superfluid phase-transition temperature: Higgs mode–like pairing amplitude modulations, analogues of the second sound in the trapped gas, and an edge mode that is also the strongest mode in the response.

Received 4 July 2013

DOI:https://doi.org/10.1103/PhysRevA.89.013602

Authors & Affiliations

A. Korolyuk¹, J. J. Kinnunen¹, and P. Törmä^1,2,*

¹COMP Centre of Excellence and Department of Applied Physics, Aalto University, FI-00076 Aalto, Finland
²Kavli Institute for Theoretical Physics, University of California, Santa Barbara, California 93106-4030, USA

^*paivi.torma@aalto.fi

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Vol. 89, Iss. 1 — January 2014

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