Small-amplitude collective modes of a finite-size unitary Fermi gas in deformed traps
Fei, Na; 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, 100 (5), 053613. DOI: 10.1103/PhysRevA.100.053613
Published inPhysical Review A
© 2019 American Physical Society
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. ...
PublisherAmerican Physical Society
Publication in research information system
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Related funder(s)Academy of Finland
Funding program(s)Academy Project, AoF
Additional information about fundingThis work was supported by the National Key R&D Program of China (Contract No. 2018YFA0404403), and the National Natural Science Foundation of China under Grants No. 11975032, No. 11835001, and No. 11790325. This work was also partially supported (M.K.) by the Academy of Finland under the Academy Project No. 318043. We also acknowledge that computations in this work were performed in Tianhe-1A located in Tianjin and Tianhe-2 located in Guangzhou. ...
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