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arXiv 2007.06977cond-mat.quant-gas
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基于QMC的包含有限程效应的密度泛函:$^{39}$ K量子液滴的激发模式

Towards a QMC-based density functional including finite-range effects: excitation modes of a $^{39}$K quantum droplet

V. Cikojević, L. Vranješ Markić, M. Pi, M. Barranco, J. Boronat

摘要:

通过引入有限程效应,解决了由不同超精细态的$^{39}$ K原子组成的量子液滴的实验结果与扩展的Gross-Pitaevskii理论(其中包含超越平均场修正)分析结果之间的一些差异。在这里,我们研究了这些效应对极稀量子液滴的四极和四极激发光谱的影响,使用密度泛函建立从第一性原理量子蒙特卡罗计算,这可以很容易地引入到现有的Gross-Pitaevskii数值求解器。我们的研究结果表明,与扩展的Gross-Pitaevskii理论中获得的结果相比,差异高达$20\%$,这可能提供了另一种通过测量混合量子液滴的最低激发频率来观察有限范围效应的方法。

英文摘要:

Some discrepancies between experimental results on quantum droplets made of a mixture of $^{39}$K atoms in different hyperfine states and their analysis within extended Gross-Pitaevskii theory (which incorporates beyond mean-field corrections) have been recently solved by introducing finite-range effects into the theory. Here, we study the influence of these effects on the monopole and quadrupole excitation spectrum of extremely dilute quantum droplets using a density functional built from first-principles quantum Monte Carlo calculations, which can be easily introduced in the existing Gross-Pitaevskii numerical solvers. Our results show differences of up to $20\%$ with those obtained within the extended Gross-Pitaevskii theory, likely providing another way to observe finite-range effects in mixed quantum droplets by measuring their lowest excitation frequencies.

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