Nonlinear modes coupling of trapped spin-orbit coupled spin-1 Bose-Einstein condensates  

作　　者：王杰 梁俊成 鱼自发 张安庆 张爱霞 薛具奎 Jie Wang;Jun-Cheng Liang;Zi-Fa Yu;An-Qing Zhang;Ai-Xia Zhang;Ju-Kui Xue(College of Physics and Electronics Engineering,Northwest Normal University,Lanzhou 730070,China)

机构地区：[1]College of Physics and Electronics Engineering,Northwest Normal University,Lanzhou 730070,China

出　　处：《Chinese Physics B》2023年第9期163-171,共9页中国物理B（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.12164042,12264045,11764039,11475027,11865014,12104374,and 11847304);the Natural Science Foundation of Gansu Province(Grant Nos.17JR5RA076 and 20JR5RA526);the Scientific Research Project of Gansu Higher Education(Grant No.2016A-005);the Innovation Capability Enhancement Project of Gansu Higher Education(Grant Nos.2020A-146 and 2019A-014);the Creation of Science and Technology of Northwest Normal University(Grant No.NWNU-LKQN-18-33)。

摘　　要：We study analytically and numerically the nonlinear collective dynamics of quasi-one-dimensional spin-orbit coupled spin-1 Bose-Einstein condensates trapped in harmonic potential.The ground state of the system is determined by minimizing the Lagrange density,and the coupled equations of motions for the center-of-mass coordinate of the condensate and its width are derived.Then,two low energy excitation modes in breathing dynamics and dipole dynamics are obtained analytically,and the mechanism of exciting the anharmonic collective dynamics is revealed explicitly.The coupling among spin-orbit coupling,Raman coupling and spin-dependent interaction results in multiple external collective modes,which leads to the anharmonic collective dynamics.The cooperative effect of spin momentum locking and spin-dependent interaction results in coupling of dipolar and breathing dynamics,which strongly depends on spin-dependent interaction and behaves distinct characters in different phases.Interestingly,in the absence of spin-dependent interaction,the breathing dynamics is decoupled from spin dynamics and the breathing dynamics is harmonic.Our results provide theoretical evidence for deep understanding of the ground sate phase transition and the nonlinear collective dynamics of the system.

关 键 词：spin-orbit coupled spin-1 Bose-Einstein condenses collective excitations nonlinear modes coupling 

分 类 号：O469[理学—凝聚态物理]