论文标题
偶极玻色 - 因子凝结物的扩展超固相的涡旋性能
Vortex properties in the extended supersolid phase of dipolar Bose-Einstein condensates
论文作者
论文摘要
我们研究了在零温度建模$^{164} $ dy Atoms下，在偶极玻色 - 因凝结物的Supersolid相中单个量化的线性涡旋的性能。该系统在$ x-y $飞机上扩展，并在极化方向$ z $中被一个谐波陷阱限制。我们的研究基于广义的pitaevskii方程。我们以空间顺序和超流体分数来表征系统的基态，并比较单个涡流和超氟相（SFP）和supersolid相（SSP）中单个涡流和涡旋偶极子的性质。与SFP中的涡流有所不同，该SFP可以在超级流体中自由移动，SSP中的涡流位于间隙位置，并且不能自由移动。我们已经计算了从平衡位点到另一个的运动障碍。涡流提交给周期电势的事实对由两个反旋转并行涡流制成的涡旋偶极子的动力学产生了巨大影响。涡流和抗突力增强的不像是在SFP中那样僵化，而是从一个站点到另一个站点的跳跃互相接近，直到它们在很短的时间内歼灭，并且它们的能量被转移到散装激励。
We study the properties of singly-quantized linear vortices in the supersolid phase of a dipolar Bose-Einstein condensate at zero temperature modeling $^{164}$Dy atoms. The system is extended in the $x-y$ plane and confined by a harmonic trap in the the polarization direction $z$. Our study is based on a generalized Gross-Pitaevskii equation. We characterize the ground state of the system in terms of spatial order and superfluid fraction and compare the properties of a single vortex and of a vortex dipole in the superfluid phase (SFP) and in the supersolid phase (SSP). At variance with a vortex in the SFP, which is free to move in the superfluid, a vortex in the SSP is localized at the interstitial sites and does not move freely. We have computed the energy barrier for motion from an equilibrium site to another. The fact that the vortex is submitted to a periodic potential has a dramatic effect on the dynamics of a vortex dipole made of two counter rotating parallel vortices; instead of rigidly translating as in the SFP, the vortex and anti-vortex approach each other by a series of jumps from one site to another until they annihilate in a very short time and their energy is transferred to bulk excitations.
