Transport of a Single Cold Ion Immersed in a Bose-Einstein Condensate
Transport of a Single Cold Ion Immersed in a Bose-Einstein Condensate
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DOI：
10.1103/physrevlett.126.033401
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发表时间：
2021-01-19
影响因子：
8.6
通讯作者：
Meinert, F.
中科院分区：
文献类型：
--
作者：
Dieterle, T.;Berngruber, M.;Meinert, F.
我们研究了单个低能离子杂质在玻色-爱因斯坦凝聚体中的输运动力学。从单个里德堡激发开始，杂质被注入到凝聚体中，该激发被一系列快速电场脉冲电离，目的是最小化离子的初始动能。利用小偏置场，我们研究了杂质在外力作用下的碰撞动力学。由于密集的简并母体气体和大的离子-原子散射截面所产生的快速离子-原子碰撞速率，使得我们能够在几十微秒内研究杂质的频繁碰撞机制。将我们的测量结果与基于连续朗之万碰撞的随机轨迹模拟进行比较，表明了杂质的扩散输运性质，并使我们能够测量其迁移率。我们的结果为研究超冷物质中带电量子杂质的动力学开辟了一条新的途径。
We investigate transport dynamics of a single low-energy ionic impurity in a Bose-Einstein condensate. The impurity is implanted into the condensate starting from a single Rydberg excitation, which is ionized by a sequence of fast electric field pulses aiming to minimize the ion's initial kinetic energy. Using a small electric bias field, we study the subsequent collisional dynamics of the impurity subject to an external force. The fast ion-atom collision rate, stemming from the dense degenerate host gas and the large ion-atom scattering cross section, allow us to study a regime of frequent collisions of the impurity within only tens of microseconds. Comparison of our measurements with stochastic trajectory simulations based on sequential Langevin collisions indicate diffusive transport properties of the impurity and allows us to measure its mobility. Our results open a novel path to study dynamics of charged quantum impurities in ultracold matter.