摘要
The collective excitations of a one-dimensional dipolar Bose–Einstein condensate trapped in an anharmonic potential are investigated theoretically.Using the variational approach,we obtain the coupled equations of motion for the center-of-mass coordinate of the condensate and its width.In particular,analytical expressions for the low-lying excitation modes are given.The results show that dipole-dipole interactions reduce the frequency shift induced by quartic distortion.The interplay between dipole-dipole interactions and anharmonic distortion for the collapse and revival of the collective excitations originating from the nonlinear coupling between the two modes are also discussed.
作者
漆伟
梁兆新
张志东
QI Wei;LIANG Zhao-Xin;ZHANG Zhi-Dong(Shenyang National Laboratory for Materials Science,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016)
基金
Supported by the National Natural Science Foundation of China under Grant Nos 11004200 and 11274315.