标题： 光学捕获极化子凝聚体中的超固体性 显示英文标题

标题： Supersolidity in Optically Trapped Polariton Condensates

摘要： 在特定条件下，超流体可以表现出连续平移对称性的自发破缺，并形成称为超固体的奇特空间有序物质状态。 尽管这一概念早在理论上就已预测，但直到半个世纪后才在超冷原子玻色-爱因斯坦凝聚体中实验上展示了由于长程原子间相互作用形成的超固体相。 在这里，我们提出一种有前景的新平台，即受限于环形光学诱导陷阱中的激子极化子超流体。 超固体相是由于系统中正常激子组分介导的有效吸引力相互作用而产生的。 实验上展示的自发形成的空间有序相与详细的平均场理论分析和数值模拟结果一致。 观察到的超固体转变的自发性进一步通过集体激发谱中特定零能纳姆布-戈德斯通模的形成得到证实。 显示英文摘要

摘要： Superfluids under specific conditions can exhibit spontaneous breaking of continuous translation symmetries and form exotic spatially ordered states of matter known as supersolids. Despite its early theoretical prediction, it took over half-a-centrury to experimentally demonstrate the supersolid phase in ultracold atomic Bose-Einstein condensates, forming due to long-range interatomic interactions. Here we propose as a promising new platform for supersolidity exciton-polariton superfluids, confined in annular optically induced traps. The supersolid phase emerges due to effective attractive interactions, mediated by the normal excitonic component of the system. Experimental demonstration of spontaneously formed spatially ordered phase is in agreement with detailed mean-field theoretical analysis and numerical simulation. The spontaneous character of the observed supersolid transition is further evidenced by the formation of specific zero-energy Nambu-Goldstone modes in the collective excitation spectrum.