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arXiv 2005.12033cond-mat.quant-gasphysics.atom-phquant-ph
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玻色-爱因斯坦凝聚体中的离子极化子

Ionic polaron in a Bose-Einstein condensate

G. E. Astrakharchik, L. A. Peña Ardila, R. Schmidt, K. Jachymski, A. Negretti

摘要:

在多体量子系统中,强相互作用的存在会导致各种奇异效应。在这里,我们表明,即使在一个相对简单的设置组成的带电杂质在弱相互作用玻色子介质的长度尺度的竞争引起高度相关的介观状态。使用量子蒙特卡罗模拟,我们解开它的极大不同的极化性质相比,中性量子杂质。此外,我们确定了制度之间的过渡服从常规微扰处理的限制弱原子-离子相互作用和多体束缚态与消失的准粒子残留物组成的数百个原子。为了分析相应态的结构,我们研究了原子-离子和原子-原子关联函数,它们都具有非平凡的性质。我们的研究结果是直接相关的实验使用混合原子离子设置,最近达到了超冷制度。

英文摘要:

The presence of strong interactions in a many-body quantum system can lead to a variety of exotic effects. Here we show that even in a comparatively simple setup consisting of a charged impurity in a weakly interacting bosonic medium the competition of length scales gives rise to a highly correlated mesoscopic state. Using quantum Monte Carlo simulations, we unravel its vastly different polaronic properties compared to neutral quantum impurities. Moreover, we identify a transition between the regime amenable to conventional perturbative treatment in the limit of weak atom-ion interactions and a many-body bound state with vanishing quasi-particle residue composed of hundreds of atoms. In order to analyze the structure of the corresponding states we examine the atom-ion and atom-atom correlation functions which both show nontrivial properties. Our findings are directly relevant to experiments using hybrid atom-ion setups that have recently attained the ultracold regime.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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