Open AccessCollective excitations of superfluid Fermi gas in an anharmonic potential
Author(s) -
Yu Zi-Fa,
Jianpeng Wu,
Pengcheng Wang,
Zhang Jiao-Jiao,
Rong-An Tang,
Ju-Kui Xue
Publication year - 2012
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.61.010301
Subject(s) - anharmonicity , physics , superfluidity , quasiparticle , amplitude , fermi gas , condensed matter physics , fermi gamma ray space telescope , quartic function , dipole , quantum mechanics , superconductivity , electron , mathematics , pure mathematics
The collective excitations of a one-dimensional superfluid Fermi gas in an anharmonic trap are investigated. By using the variational approach, the frequency shifts about the dipole mode of the center-of-mass variations and the breathing mode of width variations are derived. It is found that the frequency shift in a unitary region is more significant. Under the excitations of different driving amplitudes, the two low-energy modes are coupled due to the contribution of the quartic item, and the quantum beating phenomenon comes into being. The frequency of beating increases with the driving amplitude. The dynamics of the width exhibits complex characteristics, especially, in the unitary region.