论文标题
跨越伸长的偶极冷凝物的超丝溶质溶液过渡
Crossing the superfluid-supersolid transition of an elongated dipolar condensate
论文作者
论文摘要
如G. biagioni等人最近的实验中，我们提供了限制在细长陷阱中的偶极冷凝物的超丝溶剂相变的动力穿越的理论表征。 [物理。修订版X 12，021019（2022）]。通过包括Lee-Yang-Yang-Yang量子波动校正在内的扩展Gross-Pitaevskii理论，我们首先分析系统的基态构型作为颗粒散射长度的函数，用于实验中使用的两种陷阱构型。然后，我们讨论了坡道速度的影响，坡道速度在整个过渡过程中调节散射长度，对超氟和超酚类相的系统集体激发。我们发现，当横向限制足够强大并且过渡具有光滑的（连续）特征时，系统基本上显示了（准）1D行为，其激发动力学由轴向呼吸模式支配。取而代之的是，对于较浅的横向捕获，当过渡变得不连续时，SuperSolid的集体激发与横向模式显示出耦合，这表明尺寸交叉的开始。
We provide a theoretical characterization of the dynamical crossing of the superfluid-supersolid phase transition for a dipolar condensate confined in an elongated trap, as observed in the recent experiment by G. Biagioni et al. [Phys. Rev. X 12, 021019 (2022)]. By means of the extended Gross-Pitaevskii theory, which includes the Lee-Huang-Yang quantum fluctuation correction, we first analyze the ground state configurations of the system as a function of the interparticle scattering length, for both trap configurations employed in the experiment. Then, we discuss the effects of the ramp velocity, by which the scattering length is tuned across the transition, on the collective excitations of the system in both the superfluid and supersolid phases. We find that, when the transverse confinement is sufficiently strong and the transition has a smooth (continuous) character, the system essentially displays a (quasi) 1D behavior, its excitation dynamics being dominated by the axial breathing modes. Instead, for shallower transverse trapping, when the transition becomes discontinuous, the collective excitations of the supersolid display a coupling with the transverse modes, signalling the onset of a dimensional crossover.
