论文标题
多体结合状态以及玻色液中带电杂质的诱导相互作用
Many-body bound states and induced interactions of charged impurities in a bosonic bath
论文作者
论文摘要
浸入量子培养基中的诱导相互作用和绑定的电荷载体对量子转运的研究至关重要。 Ultracold Atom-Ion Systems可以为研究此问题提供便捷的平台。在这里，我们使用量子蒙特卡洛方法研究了在骨髓浴中一种和两个离子杂质的静态特性。我们根据原子离子电位的强度及其两体结合状态的数量确定三个双极性制度：一种扰动制度，类似于一对中性杂质的状况，一种非扰动的制度，它失去了前者的准晶状体特征，并且在两者之间仅在两国势力下才能实现这一势头。我们进一步揭示了两个离子极化子之间强烈的浴感诱导的相互作用。我们的发现表明，数值模拟对于描述高度相关的杂质模型是必不可少的。
Induced interactions and bound states of charge carriers immersed in a quantum medium are crucial for the investigation of quantum transport. Ultracold atom-ion systems can provide a convenient platform for studying this problem. Here, we investigate the static properties of one and two ionic impurities in a bosonic bath using quantum Monte Carlo methods. We identify three bipolaronic regimes depending on the strength of the atom-ion potential and the number of its two-body bound states: a perturbative regime resembling the situation of a pair of neutral impurities, a non-perturbative regime that loses the quasi-particle character of the former, and a many-body bound state regime that can arise only in the presence of a bound state in the two-body potential. We further reveal strong bath-induced interactions between the two ionic polarons. Our findings show that numerical simulations are indispensable for describing highly correlated impurity models.
