arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2011.03924cond-mat.quant-gas
收藏

有限温度下囚禁玻色-玻色混合物的量子蒙特卡罗方法

Trapped Bose-Bose mixtures at finite temperature: a quantum Monte Carlo approach

K. Dželalija, V. Cikojević, J. Boronat, L. Vranješ Markić

摘要:

本文用量子蒙特卡罗方法研究了束缚玻色-玻色混合物在稀态下的热性质。我们的主要目的是调查的超流密度和冷凝分数对温度的依赖性,为混合相和分离相。为此,我们使用扩散蒙特卡罗方法,在零温度限制,和路径积分蒙特卡罗方法有限的温度。所得到的结果进行了比较,在零温度下的混合物的耦合Gross-Pitaevskii方程的解决方案。我们注意到在某些相分离的混合物中存在各向异性的超流密度。我们的研究结果还表明,超流密度和冷凝分数的温度演化略有不同,显示值得注意的情况下,超流分数小于冷凝分数。

英文摘要:

We study thermal properties of a trapped Bose-Bose mixture in a dilute regime using quantum Monte Carlo methods. Our main aim is to investigate the dependence of the superfluid density and the condensate fraction on temperature, for the mixed and separated phases. To this end, we use the diffusion Monte Carlo method, in the zero-temperature limit, and the path-integral Monte Carlo method for finite temperatures. The results obtained are compared with solutions of the coupled Gross-Pitaevskii equations for the mixture at zero temperature. We notice the existence of an anisotropic superfluid density in some phase-separated mixtures. Our results also show that the temperature evolution of the superfluid density and condensate fraction is slightly different, showing noteworthy situations where the superfluid fraction is smaller than the condensate fraction.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑