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

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dc.contributor University of Helsinki, Helsinki Institute of Physics en
dc.contributor.author Fei, Na
dc.contributor.author Pei, J. C.
dc.contributor.author Wang, K.
dc.contributor.author Kortelainen, M.
dc.date.accessioned 2020-02-21T09:20:01Z
dc.date.available 2020-02-21T09:20:01Z
dc.date.issued 2019-11-14
dc.identifier.citation 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 en
dc.identifier.issn 2469-9926
dc.identifier.other PURE: 130559570
dc.identifier.other PURE UUID: c1ccb333-d9ce-4325-adeb-9a9ae8300405
dc.identifier.other WOS: 000496566400005
dc.identifier.other ORCID: /0000-0001-6244-764X/work/68616855
dc.identifier.uri http://hdl.handle.net/10138/312073
dc.description.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. en
dc.format.extent 10
dc.language.iso eng
dc.relation.ispartof Physical Review A
dc.rights en
dc.subject EXCITATIONS en
dc.subject 114 Physical sciences en
dc.title Small-amplitude collective modes of a finite-size unitary Fermi gas in deformed traps en
dc.type Article
dc.description.version Peer reviewed
dc.identifier.doi https://doi.org/10.1103/PhysRevA.100.053613
dc.type.uri info:eu-repo/semantics/other
dc.type.uri info:eu-repo/semantics/publishedVersion
dc.contributor.pbl

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