标题： 杂质与热玻色气体强相互作用的演化 显示英文标题

标题： Fate of an impurity strongly interacting with a thermal Bose gas

摘要： 我们对浸入均匀玻色子浴（一个箱形束缚的玻色气体）中的移动杂质进行光谱研究，改变浴温以及杂质-浴相互作用的强度。 我们将结果与准纯玻色-爱因斯坦凝聚体（BEC）的结果进行比较，并发现对于强杂质-浴相互作用，随着温度升高，光谱变窄，而杂质能量位移被抑制。 在凝聚临界温度附近，多体效应仍然起重要作用，只有在非简并浴的情况下，系统才接近经典的玻尔兹曼气体行为。 理想玻色极化子理论能够再现关键的光谱特征。 显示英文摘要

摘要： We spectroscopically study mobile impurities immersed in a homogeneous bosonic bath (a box-trapped Bose gas), varying the bath temperature and the strength of impurity-bath interactions. We compare our results to those for a quasipure Bose-Einstein condensate (BEC), and find that for strong impurity-bath interactions, the spectra narrow with increasing temperature, while the impurity energy shift is suppressed. Near the critical temperature for condensation, many-body effects still play an important role, and only for a nondegenerate bath, the system approaches the classical Boltzmann-gas behavior. The key spectral features are reproduced within the theory of an ideal Bose polaron.