论文标题
玻色网凝结物中极地的动态形成：一种变异方法
Dynamical formation of polarons in a Bose-Einstein condensate: A variational approach
论文作者
论文摘要
我们与最近的实验结果相比，我们研究了与Bose-Einstein冷凝物偶联的杂质的非平衡动力学[M. G. Skou等，Nat。物理。 （2021）]。通过使用时间依赖的变分相干ansatz来追踪杂质的动力学。对于杂质和浴室之间的弱耦合，得出时间依赖性重叠（或对比度）的分析表达式，与在主方程方法中获得的先前发现非常匹配。相反，对于强耦合，差异ANSATZ提供了良好的定量描述，尤其是在信号从少数人到多体相关方向的过渡时，在这些动力学上提供了预期形成极性的旋转方案。
We investigate the non-equilibrium dynamics of an impurity coupled to a Bose-Einstein condensate, systematically compared with recent experimental results [M. G. Skou et al., Nat. Phys. (2021)]. The dynamics of the impurity is tracked down by using a time-dependent variational coherent ansatz. For weak coupling between the impurity and the bath, analytical expressions for the time-dependent overlap (or contrast) are derived, matching quite well with previous findings obtained within a master equation approach. For strong coupling instead, the variational ansatz provides a good quantitative description of the polaron dynamics, in particular, in signaling the transition from the few to the many-body correlated regime where polarons are expected to form.
