标题： 强偶极凝聚体中的空心圆柱状液滴 显示英文标题

标题： Hollow cylindrical droplets in a very strongly dipolar condensate

摘要： 一个谐波束缚的玻色-爱因斯坦凝聚体（BEC）导致拓扑平凡的紧凑状态。 由于长程非局域的偶极-偶极相互作用，强偶极性BEC展现了许多新现象。 在这里，我们表明在强偶极性BEC中，可以在仅由谐波势和中心高斯山势束缚于$x$-$y$平面且沿极化$z$轴未被束缚的系统中，获得具有环形拓扑的空心圆柱准一维亚稳液滴。 在这一数值研究中，我们使用了包含Lee-Huang-Yang相互作用的平均场模型的虚时传播，并对其进行了适合偶极系统的修改。 作为亚稳态，这些液滴是弱稳定的，我们使用实时传播来研究其动力学并确定稳定性。 显示英文摘要

摘要： A harmonically trapped Bose-Einstein condensate (BEC) leads to topologically trivial compact states. Because of the long-range nonlocal dipole-dipole interaction, a strongly dipolar BEC revealed many novel phenomena. Here we show that in a strongly dipolar BEC one can have a hollow cylindrical quasi-one-dimensional metastable droplet with ring topology while the system is trapped only in the $x$-$y$ plane by a harmonic potential and a Gaussian hill potential at the center and untrapped along the polarization $z$ axis. In this numerical investigation we use the imaginary-time propagation of a mean-field model where we include the Lee-Huang-Yang interaction, suitably modified for dipolar systems. Being metastable, these droplets are weakly stable and we use real-time propagation to investigate its dynamics and establish stability.