A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Small-amplitude collective modes of a finite-size unitary Fermi gas in deformed traps (2019)

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, 100(5), Article 053613. https://doi.org/10.1103/PhysRevA.100.053613

JYU-tekijät tai -toimittajat

Julkaisun tiedot

Julkaisun kaikki tekijät tai toimittajat: Fei, Na; Pei, J. C.; Wang, K.; Kortelainen, M.

Lehti tai sarja: Physical Review A

ISSN: 2469-9926

eISSN: 2469-9934

Julkaisuvuosi: 2019

Volyymi: 100

Lehden numero: 5

Artikkelinumero: 053613

Kustantaja: American Physical Society

Julkaisumaa: Yhdysvallat (USA)

Julkaisun kieli: englanti

DOI: https://doi.org/10.1103/PhysRevA.100.053613

Julkaisun avoin saatavuus: Ei avoin

Julkaisukanavan avoin saatavuus: 

Julkaisu on rinnakkaistallennettu (JYX): https://jyx.jyu.fi/handle/123456789/66412

Rinnakkaistallenteen verkko-osoite (pre-print): https://arxiv.org/abs/1907.13473

Tiivistelmä

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.

YSO-asiasanat: tiheysfunktionaaliteoria

Vapaat asiasanat: density functional theory; fermi gases; ultracold gases; random phase approximation

Liittyvät organisaatiot

Hankkeet, joissa julkaisu on tehty

OKM-raportointi: Kyllä

Raportointivuosi: 2019

JUFO-taso: 2