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arXiv · 2107.05905

Dilute quantum liquid in a K-Rb Bose mixture

Viktor Cikojević·Elena Poli·Francesco Ancilotto·Leandra Vranješ Markić·Jordi Boronat
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Abstract

A quantum liquid in a heterogeneous mixture of $^{41}$K and $^{87}$Rb atoms is studied using the diffusion Monte Carlo method and Density Functional Theory. The perturbative Lee-Huang-Yang term for a heterogeneous mixture is verified and it is proved to be valid only near the gas-liquid transition. Based on the equations of state of the bulk mixture, calculated with diffusion Monte Carlo, extensions to Lee-Huang-Yang corrected mean-field energy functionals (MF+LHY) are presented. Using Density Functional Theory, a systematic comparison between different functionals is performed, focusing on the critical atom number, surface tension, surface width, Tolman length, and compressibility. These results are given as a function of the inter-species interaction strength, within the stability domain of the liquid mixture.

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cond-mat.quant-gasphysics.atom-phphysics.comp-phphysics.flu-dynquant-ph

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Viktor Cikojević, Elena Poli, Francesco Ancilotto, Leandra Vranješ Markić, Jordi Boronat. 2021-07-13. Dilute quantum liquid in a K-Rb Bose mixture. https://doi.org/10.1103/physreva.104.033319

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