We investigate the superfluidity and the coherence in dipolar binary Bose mixtures using the hydrodynamic approach. Useful analytical formulas for the excitation spectra, the first-order correlation function, the static structure factor, and the superfluid fraction are derived. We find that in the case of highly imbalanced mixture, the superfluidity can occur in the dilute component only at extremely low temperatures. The behavior of the first-order correlation function for both dipolar and nondipolar Bose mixtures is deeply analyzed. Then we face the two-dimensional case which encodes a non-trivial physics due to the roton modes.

中文翻译：

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均匀偶极二元Bose混合物中的超流动性和相干性

我们使用流体力学方法研究偶极二元Bose混合物中的超流动性和相干性。得出了有关激发光谱，一阶相关函数，静态结构因子和超流体分数的有用分析公式。我们发现，在高度不平衡的混合物的情况下，只有在极低的温度下，稀释组分中才会出现超流动性。对偶极和非偶极Bose混合物的一阶相关函数的行为进行了深入分析。然后，我们面对二维情况，由于roton模式，该情况对非平凡的物理学进行了编码。