非简谐势中两组分简并费米气体的集体激发

Collective excitations of two-component degenerate Fermi gases in an anharmonic trap

研究了在一个扭曲的谐振势中两组分简并费米气体的集体激发.运用变分法导出了1组描述两组分简并费米气体质心运动与宽度变化的耦合方程,获得了2个低能激发模.在不同的有效s波相互作用和有效p波相互作用下,分别讨论了由于势的非简谐改变引起的集体激发的频移和集体激发的塌缩与恢复.

The collective excitations of two-component degenerate Fermi gases in a harminic trap with a quartic distortion are investigated. Using variational approaches, the coupled equations of motions for the center-of-mass coordinate and width of two-component degenerate Fermi gases are derived. Then two lowenergy excitation modes are obtained analytically. The freqency shift, collapse and revival of the collective excitations of two-component degenerate Fermi gases induced by the anharmonic distortion under different values of the effective s- and p-wave interactions are discussed, respectively.