标题： 束缚偶极玻色混合物中双超固体的激发谱 显示英文标题

标题： Excitation spectrum of a double supersolid in a trapped dipolar Bose mixture

摘要： 偶极玻色-爱因斯坦凝聚体是研究超固体性的优秀平台，其特征是密度调制和超流性的共存。 偶极混合物的实现开辟了引人入胜的新场景，最显著的是实现了由两个相互作用的超流体组成的双超固体的可能性。 我们分析了可混溶的束缚偶极玻色混合物的复杂激发谱，表明它提供了关于双超固体区域的关键见解。 我们表明，通过监测与每个组分不同超流特性相关的超流压缩模式的双峰出现，可以轻松地在实验中探测到这一区域。 此外，偶极超固体混合物表现出偶极罗顿的非平凡自旋性质、希格斯激发以及低能戈德斯通模。 有趣的是，对最低能模式的分析允许监测其中一个组分进入非相干液滴区域的转变，而另一个组分仍保持相干性，突显了它们不同的超流特性。 显示英文摘要

摘要： Dipolar Bose-Einstein condensates are excellent platforms for studying supersolidity, characterized by coexisting density modulation and superfluidity. The realization of dipolar mixtures opens intriguing new scenarios, most remarkably the possibility of realizing a double supersolid, composed by two interacting superfluids. We analyze the complex excitation spectrum of a miscible trapped dipolar Bose mixture, showing that it provides key insights about the double supersolid regime. We show that this regime may be readily probed experimentally by monitoring the appearance of a doublet of superfluid compressional modes, linked to the different superfluid character of each component. Additionally, the dipolar supersolid mixture exhibits a non-trivial spin nature of the dipolar rotons, the Higgs excitation, and the low-lying Goldstone modes. Interestingly, the analysis of the lowest-lying modes allows for monitoring the transition of just one of the components into the incoherent droplet regime, whereas the other remains coherent, highlighting their disparate superfluid properties.