论文标题
环形偶极超固体中的持续电流
Persistent Currents in Toroidal Dipolar Supersolids
论文作者
论文摘要
我们研究了被困在环形几何形状中的偶极玻色菌冷凝物的旋转特性。在研究旋转框架和固定角动量时的基态，我们观察到凝聚力的作用明显不同，具体取决于它是在超氟中还是在超莫利相中。我们发现，有趣的是，环形偶极冷凝物可以支持固体持续的电流，该电流在基态能量的局部最小值中作为角动量的函数，在凝结物的超流体成分中，状态具有涡流溶液。这种状态的衰减是由障碍所阻止的，该障碍部分由与涡流相反的方向模仿凝聚力固体旋转的状态。此外，旋转的环形固体显示出滞后行为，根据冷凝水的超流体分数在质量上有所不同。
We investigate the rotational properties of a dipolar Bose-Einstein condensate trapped in a toroidal geometry. Studying the ground states in the rotating frame and at fixed angular momenta, we observe that the condensate acts in distinctly different ways depending on whether it is in the superfluid or in the supersolid phase. We find that intriguingly, the toroidal dipolar condensate can support a supersolid persistent current which occurs at a local minimum in the ground state energy as a function of angular momentum, where the state has a vortex solution in the superfluid component of the condensate. The decay of this state is prevented by a barrier that in part consists of states where a fraction of the condensate mimics solid-body rotation in a direction opposite to that of the vortex. Furthermore, the rotating toroidal supersolid shows hysteretic behavior that is qualitatively different depending on the superfluid fraction of the condensate.
