Controllable nonlocal interactions between dark solitons in dipolar condensates
Controllable nonlocal interactions between dark solitons in dipolar condensates
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DOI：
10.1103/physreva.92.063601
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发表时间：
2015-09
影响因子：
2.9
通讯作者：
Thomas Bland;M. Edmonds;N. Proukakis;A. M. Martin;D. O'Dell;N. Parker
中科院分区：
文献类型：
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作者：
Thomas Bland;M. Edmonds;N. Proukakis;A. M. Martin;D. O'Dell;N. Parker
研究准一维偶极玻色-爱因斯坦凝聚体中的静态暗孤子和运动暗孤子，探索它们的修正形式和相互作用。孤子的密度凹陷就像一个巨大的反偶极子，它为传统的局域孤子-孤子相互作用增加了非局域贡献。我们绘制了作为原子偶极子强度和极化方向的函数的稳定性图，识别了旋子和声子的不稳定性。远离这些不稳定性，孤子就会弹性碰撞。改变相对于凝聚体轴线的偏振方向使得能够调谐排斥和吸引之间的这种非局域相互作用；后者支持不寻常的暗孤子束缚态。值得注意的是，这些束缚态本身的行为就像孤立子，在相互碰撞中毫发无损。
We study the family of static and moving dark solitons in quasi-one-dimensional dipolar Bose-Einstein condensates, exploring their modified form and interactions. The density dip of the soliton acts as a giant anti-dipole which adds a non-local contribution to the conventional local soliton-soliton interaction. We map out the stability diagram as a function of the strength and polarization direction of the atomic dipoles, identifying both roton and phonon instabilities. Away from these instabilities, the solitons collide elastically. Varying the polarization direction relative to the condensate axis enables tuning of this non-local interaction between repulsive and attractive; the latter case supports unusual dark soliton bound states. Remarkably, these bound states are themselves shown to behave like solitons, emerging unscathed from collisions with each other.