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arXiv 2008.05246cond-mat.quant-gas
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稀玻色气体的热力学:玻色-爱因斯坦凝聚体二元混合物的平均场论之外

Thermodynamics of dilute Bose gases: Beyond mean-field theory for binary mixtures of Bose-Einstein condensate

Miki Ota, Stefano Giorgini

摘要:

我们研究了二元玻色混合物的热力学性质,通过发展一个超越平均场的波波夫理论,该理论适当地包括了密度和自旋通道中的量子和热涨落的影响。关键的热力学量,如等温压缩性和磁化率的结果,来自巨正则势的微扰计算。我们发现,热波动可以对二元混合物的溶解性条件起关键作用,即使混合物在零温度下是可溶的,也有利于在有限温度下的相分离,如在先前的工作中已经预期的那样[Ota等人,物理修订版信函123,075301(2019)]。我们进一步研究了在种内相互作用以及两个组分的质量中存在不对称性的二元混合物的相容性条件。此外,我们讨论了混合物的超流行为和Andreev-Bashkin效应的温度依赖性。

英文摘要:

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.

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