Small-amplitude collective modes of a finite-size unitary Fermi gas in deformed traps

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Fei , N , Pei , J C , Wang , K & Kortelainen , M 2019 , ' Small-amplitude collective modes of a finite-size unitary Fermi gas in deformed traps ' , Physical Review A , vol. 100 , no. 5 , 053613 . https://doi.org/10.1103/PhysRevA.100.053613

Title: Small-amplitude collective modes of a finite-size unitary Fermi gas in deformed traps
Author: Fei, Na; Pei, J. C.; Wang, K.; Kortelainen, M.
Contributor: University of Helsinki, Helsinki Institute of Physics
Date: 2019-11-14
Language: eng
Number of pages: 10
Belongs to series: Physical Review A
ISSN: 2469-9926
URI: http://hdl.handle.net/10138/312073
Abstract: We have investigated collective breathing modes of a unitary Fermi gas in deformed harmonic traps. The ground state is studied by the superfluid local density approximation (SLDA) and small-amplitude collective modes are studied by the iterative quasiparticle random phase approximation (QRPA). The results illustrate the evolutions of collective modes of a small system in traps from spherical to elongated or pancake-shaped deformations. For small spherical systems, the influences of different SLDA parameters are significant, and, in particular, a large pairing strength can shift up the oscillation frequency of collective modes. The transition currents from QRPA show that the compressional flow patterns are nontrivial and dependent on the deformation. Finally, the finite-size effects are demonstrated to be reasonable when progressing towards larger systems. The hydrodynamical results of collective frequencies can be reproduced by SLDA-QRPA with reduced pairing strengths. Our studies indicate that experiments on small and medium systems are valuable for understanding effective interactions in systems with varying sizes and trap deformations.
Subject: EXCITATIONS
114 Physical sciences
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