Kartashov Yaroslav V, Zezyulin Dmitry A
ICFO-Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology, 08860 Castelldefels (Barcelona), Spain.
Institute of Spectroscopy, Russian Academy of Sciences, Troitsk, Moscow, 108840, Russia.
Phys Rev Lett. 2019 Mar 29;122(12):123201. doi: 10.1103/PhysRevLett.122.123201.
We consider two-dimensional spin-orbit-coupled atomic Bose-Einstein condensate in a radially periodic potential. The system supports different types of stable self-sustained states including radially symmetric vorticity-carrying modes with different topological charges in two spinor components that may have multiring profiles and at the same time remain remarkably stable for repulsive interactions. Solitons of the second type show persistent rotation with constant angular frequency. They can be stable for both repulsive and attractive interatomic interactions. Because of the inequivalence between clockwise and counterclockwise rotation directions introduced by spin-orbit coupling, the properties of such solitons strongly differ for positive and negative rotation frequencies. The collision of solitons located in the same or different rings is accompanied by a change of the rotation frequency that depends on the phase difference between colliding solitons.
我们考虑处于径向周期势中的二维自旋轨道耦合原子玻色-爱因斯坦凝聚体。该系统支持不同类型的稳定自持态，包括在两个自旋分量中具有不同拓扑电荷的径向对称涡旋携带模式，这些模式可能具有多环轮廓，并且对于排斥相互作用同时保持显著稳定。第二类孤子以恒定角频率持续旋转。它们对于排斥和吸引原子间相互作用都可以是稳定的。由于自旋轨道耦合引入的顺时针和逆时针旋转方向之间的不等价性，此类孤子的性质对于正旋转频率和负旋转频率有很大差异。位于相同或不同环中的孤子碰撞伴随着旋转频率的变化，该变化取决于碰撞孤子之间的相位差。
