Collective-mode dynamics in a spin-orbit-coupled Bose-Einstein condensate
Collective-mode dynamics in a spin-orbit-coupled Bose-Einstein condensate
复制标题
自旋轨道耦合玻色-爱因斯坦凝聚体中的集体模式动力学
DOI：
10.1103/physreva.86.041604
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发表时间：
2012-10
影响因子：
2.9
通讯作者：
Zhai, Hui
中科院分区：
文献类型：
--
作者：
Chen, Zhu;Zhai, Hui
最近，利用双光子拉曼耦合实验实现了自旋-轨道耦合玻色凝聚体，该凝聚体呈现出两种不同的平衡相，即平面波相和条纹相.在这个快速通信中，我们表明，这种凝聚体表现出独特的动力学行为，这源于相互作用，在一个非相互作用系统中是不存在的。在平面波相位中，偶极模式将在其垂直平面中诱导呼吸模式，反之亦然。这是自旋速度锁定和自旋相关相互作用之间的协同效应。而在条纹相，呼吸模式将导致密度条纹沿沿着其垂直方向的滑动模式。这反映了这样一个事实，即滑动模式是由于自发的空间平移对称性破缺在这个阶段的无隙激发。
Recently a spin-orbit-coupled Bose condensate has been realized experimentally using two-photon Raman coupling, and this condensate exhibits two distinct equilibrium phases known as the plane wave phase and the stripe phase at equilibrium. In this Rapid Communication we show that such condensate exhibits unique dynamic behaviors, which originate from interactions and are absent in a noninteracting system. In the plane wave phase, a dipole mode will induce a breathing mode in its perpendicular plane and vice versa. This is a cooperation effect between spin-velocity locking and spin-dependent interaction. While in the stripe phase, a breathing mode will induce the sliding mode of the density stripe along its perpendicular direction. This reflects the fact that the sliding mode is the gapless excitation in this phase due to spontaneous spatial translation symmetry breaking.