论文标题
玻色子凝结物中带电的极性和分子
Charged polarons and molecules in a Bose-Einstein Condensate
论文作者
论文摘要
我们使用不同的理论方法研究了浸入Bose-Einstein冷凝物（BEC）中的可移动离子。连贯的状态变异ANSATZ预测，离子光谱函数除了偏光型准粒子状态外还表现出多个分支，并且我们对BEC中的离子原子散射进行了示意分析，以识别它们，因为它们是由于钾盐量增加与离子的结合而引起的。我们开发了一个简化的模型，描述了这些分子离子的形成，表明它们的光谱重量尺度与结合原子的数量。离子周围的敷料云中的原子数量是根据热力学论证计算得出的，我们最终表明，将离子注射到BEC中的动力学表现出了由相干准粒子繁殖和衰减控制的各种方案。
We investigate the properties a mobile ion immersed in a Bose-Einstein condensate (BEC) using different theoretical approaches. A coherent state variational ansatz predicts that the ion spectral function exhibits several branches in addition to polaronic quasiparticle states, and we employ a diagrammatic analysis of the ion-atom scattering in the BEC to identify them as arising from the binding of an increasing number of bosons to the ion. We develop a simplified model describing the formation of these molecular ions showing that their spectral weight scales with the number of bound atoms. The number of atoms in the dressing cloud around the ion are calculated from thermodynamic arguments, and we finally show that the dynamics ensuing the injection of an ion into the BEC exhibits various regimes governed by coherent quasiparticle propagation and decay.
