Dipolar dark solitons
Dipolar dark solitons
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DOI：
10.1088/1367-2630/17/10/105006
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发表时间：
2015-08
影响因子：
3.3
通讯作者：
K. Pawłowski;K. Rzążewski
中科院分区：
文献类型：
--
作者：
K. Pawłowski;K. Rzążewski
本文数值模拟并研究了准一维阱中偶极气体中类暗孤子激发的基本性质。这些激发虽然与具有接触相互作用的气体中的暗孤子非常相似，但它们彼此相互作用并可以形成束缚态。在碰撞过程中，这些偶极孤子发射声子，失去能量但加速。即使经过数千次的碰撞，它们仍然以灰孤子的形式存在，并最终与背景准粒子达到动力学平衡。最后，在经典场近似的框架下，我们验证了这些孤子在热样品中自发出现，类似于具有接触相互作用的原子气体中的II型激发。
We numerically generate and then study the basic properties of dark soliton-like excitations in a dipolar gas confined in a quasi one-dimensional trap. These excitations, although very similar to dark solitons in a gas with contact interaction, interact with each other and can form bound states. During collisions these dipolar solitons emit phonons, losing energy but accelerating. Even after thousands of subsequent collisions they survive as gray solitons and finally reach dynamical equilibrium with background quasiparticles. Finally, in the frame of classical field approximation, we verified, that these solitons appear spontaneously in thermal samples, analogously to the type II excitations in a gas of atoms with contact interaction.