Reverse Rotation of Ring-Shaped Perturbation on Homogeneous Bose–Einstein Condensates  

作　　者：Peng Gao Zeyu Wu Zhan-Ying Yang Wen-Li Yang 高鹏;吴泽宇;杨战营;杨文力(School of Physics,Northwest University,Xi’an 710127,China;Shaanxi Key Laboratory for Theoretical Physics Frontiers,Xi’an 710127,China;Department of Physics and Astronomy,University College London,London WC1E 6BT,UK;Peng Huanwu Center for Fundamental Theory,Xi’an 710127,China;Institute of modern Physics,Northwest University,Xi’an 710127,China)

机构地区：[1]School of Physics,Northwest University,Xi’an 710127,China [2]Shaanxi Key Laboratory for Theoretical Physics Frontiers,Xi’an 710127,China [3]Department of Physics and Astronomy,University College London,London WC1E 6BT,UK [4]Peng Huanwu Center for Fundamental Theory,Xi’an 710127,China [5]Institute of modern Physics,Northwest University,Xi’an 710127,China

出　　处：《Chinese Physics Letters》2021年第9期11-17,共7页中国物理快报（英文版）

基　　金：Supported by the National Natural Science Foundation of China(Grant Nos.11875220 and 12047502)。

摘　　要：We numerically study the dynamics of rotating ring-shaped perturbation on two-dimensional homogeneous Bose–Einstein condensates,where a new ring-shaped structure with reverse rotation appears.The reversely rotating mode is directly caused by the existence of the plane wave(namely the homogeneous background).By the modified linear stability analysis method,we quantitatively predict the influence of the background’s density on perturbation dynamics,including the velocity,amplitude,and frequency of the two rings.We construct an approximative solution to describe the short-lived dynamics of initial perturbation,which agrees well with our numerical results.Also,after the two rings separate,the transfer of atom number between them becomes linear,and the rate of transfer is impacted by the radial momentum of initial perturbation.

关 键 词：PERTURBATION PERTURBATION EINSTEIN 

分 类 号：O469[理学—凝聚态物理]