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arXiv 2104.12967cond-mat.quant-gasnlin.PSnlin.SI
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超流中的铁暗孤子:精确解和反常动力学

Propagating Ferrodark Solitons in a Superfluid: Exact Solutions and Anomalous Dynamics

Xiaoquan Yu, P. B. Blakie

摘要:

在铁磁自旋为1的玻色-爱因斯坦凝聚体的易平面相中发现了精确的传播拓扑孤子,表现为横向磁化的扭结。只有在施加纵向破磁磁场时才可能传播。这种孤子有两种类型:一种是具有正惯性质量的低能分支,另一种是具有负惯性质量的高能分支。这两种类型在最大速度下变得相同,这是一个新的速度界限,不同于由基本激励设定的速度界限。物理质量,这占了数密度下降,是负的两种类型。在线性势作用下的有限一维系统中,孤子会经历由两种类型之间的跃迁引起的振荡,这种跃迁以最大速度发生。

英文摘要:

Exact propagating topological solitons are found in the easy-plane phase of ferromagnetic spin-1 Bose-Einstein condensates, manifesting themselves as kinks in the transverse magnetization. Propagation is only possible when the symmetry-breaking longitudinal magnetic field is applied. Such solitons have two types: a low energy branch with positive inertial mass and a higher branch solution with negative inertial mass. Both types become identical at the maximum speed, a new speed bound that is different from speed limits set by the elementary excitations. The physical mass, which accounts for the number density dip, is negative for both types. In a finite one-dimensional system subject to a linear potential, the soliton undergoes oscillations caused by transitions between the two types occurring at the maximum speed.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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