Dilute quantum liquid in a K-Rb Bose mixture

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.

References in corpus (27)

• Feshbach Resonances in Ultracold Gases
• Quantum Mechanical Stabilization of a Collapsing Bose-Bose Mixture
• Quantum liquid droplets in a mixture of Bose-Einstein condensates
• Self-bound quantum droplets in atomic mixtures
• Quantum-fluctuation-driven crossover from a dilute Bose-Einstein condensate to a macro-droplet in a dipolar quantum fluid
• Ultradilute low-dimensional liquids
• Feshbach resonances in rubidium 87: Precision measurement and analysis
• Observation of Quantum Droplets in a Heteronuclear Bosonic Mixture
• Collisions of self-bound quantum droplets
• Feshbach resonances in ultracold K(39)
• Dilute dipolar quantum droplets beyond the extended Gross-Pitaevskii equation
• Quantum droplets of dipolar mixtures
• Universality in ultradilute liquid Bose-Bose mixtures
• Consistent theory of self-bound quantum droplets with bosonic pairing
• Ultradilute quantum liquid drops
• Beyond Lee-Huang-Yang description of self-bound Bose mixtures
• Quantum droplets in one-dimensional Bose mixtures: a quantum Monte-Carlo study
• Self-bound ultra dilute Bose mixtures within Local Density Approximation
• Self-bound Bose mixtures
• Collective excitations of a spherical ultradilute quantum droplet
• Finite-range effects in ultradilute quantum drops
• Quadratic diffusion Monte Carlo and pure estimators for atoms
• Effective expression of the Lee-Huang-Yang energy functional for heteronuclear mixtures
• Vorticity and quantum turbulence in the merging of superfluid Helium nanodroplets
• Collisional and molecular spectroscopy in an ultracold Bose-Bose mixture
• BCS-BEC Crossover in Atomic Fermi Gases with a Narrow Resonance
• Towards a QMC-based density functional including finite-range effects: excitation modes of a ${}^{39}$K quantum droplet