论文标题
稀体气体的热力学：超出玻色酿凝结物二元混合物的平均场理论
Thermodynamics of dilute Bose gases: Beyond mean-field theory for binary mixtures of Bose-Einstein condensate
论文作者
论文摘要
我们通过开发一个均值的波波夫理论来研究二进制玻璃混合物的热力学特性，该理论适当地包含了密度和自旋通道中量子和热波动的影响。关键热力学量（例如等温可压缩性和磁化率）的结果源自大典型电位的扰动计算。我们发现，热波动在二进制混合物的混杂条件上可以发挥至关重要的作用，即使混合物在零温度下溶于零温度，也有利于相分离，正如先前工作中已经预期的那样[OTA等人，Phys。莱特牧师。 123，075301（2019）]。我们进一步研究了在物种相互作用以及两个组分的质量中存在不对称性的情况下二元混合物的混杂条件。此外，我们讨论了混合物的超流行行为以及Andreev-Bashkin效应的温度依赖性。
We study the thermodynamic properties of binary Bose mixtures, by developing a beyond mean-field Popov theory which properly includes the effects of quantum and thermal fluctuations in both the density and spin channels. Results for key thermodynamic quantities, such as the isothermal compressibility and the magnetic susceptibility, are derived from a perturbative calculation of the grand-canonical potential. We find that thermal fluctuations can play a crucial role on the miscibility condition of a binary mixture, favoring phase separation at finite temperature even if the mixture is soluble at zero temperature, as already anticipated in a previous work [Ota et al., Phys. Rev. Lett. 123, 075301 (2019)]. We further investigate the miscibility condition for binary mixtures in the presence of asymmetry in the intra-species interactions, as well as in the masses of the two components. Furthermore, we discuss the superfluid behavior of the mixture and the temperature dependence of the Andreev-Bashkin effect.
