论文标题
偶极超酚玻璃纤维 - 凝结气体中的量化涡流
Quantized vortices in dipolar supersolid Bose-Einstein condensed gases
论文作者
论文摘要
我们通过广义的GROSS-PITAEVSKII方程研究了偶极玻色子凝结气体中量化涡旋的性能。涡旋芯的尺寸通过增加偶极相互作用的重量并接近过渡阶段而大大增加。由于互助区域中密度的降低，超固体的能量稳定涡流的存在的临界角速度会降低。与涡旋线相关的每个粒子的角动量显示出小于$ \ hbar $，这反映了全局超流量的降低。旋转陷阱中的实时涡旋成核被证明是通过四极模式的软化而触发标准冷凝物的。对于较大的角速度，当涡旋之间的距离与互助的距离相当时，涡流被排列到蜂窝结构中，该结构与Supersolid lattice的三角形几何形状并存，并在原子云的自由膨胀过程中持续存在。
We investigate the properties of quantized vortices in a dipolar Bose-Einstein condensed gas by means of a generalised Gross-Pitaevskii equation. The size of the vortex core hugely increases by increasing the weight of the dipolar interaction and approaching the transition to the supersolid phase. The critical angular velocity for the existence of an energetically stable vortex decreases in the supersolid, due to the reduced value of the density in the interdroplet region. The angular momentum per particle associated with the vortex line is shown to be smaller than $\hbar$, reflecting the reduction of the global superfluidity. The real-time vortex nucleation in a rotating trap is shown to be triggered, as for a standard condensate, by the softening of the quadrupole mode. For large angular velocities, when the distance between vortices becomes comparable to the interdroplet distance, the vortices are arranged into a honeycomb structure, which coexists with the triangular geometry of the supersolid lattice and persists during the free expansion of the atomic cloud.
