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

作　　者：薛具奎[1] 刘国荣[1] 李好财[1] 张科智[1] 

机构地区：[1]西北师范大学物理与电子工程学院,甘肃兰州730070

出　　处：《西北师范大学学报（自然科学版）》2010年第1期26-32,共7页Journal of Northwest Normal University(Natural Science)

基　　金：国家自然科学基金资助项目(10774120);甘肃省自然科学基金资助项目(3ZS051-A25-013);西北师范大学科技创新工程资助项目(NWNU-KJCXGC-03-17;NWNU-KJCXGC-03-48)

摘　　要：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.

关 键 词：两组分简并费米气体 非简谐势阱 集体激发 频移 塌缩与恢复 

分 类 号：O561.4[理学—原子与分子物理]