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arXiv · 2301.04417

Quantum Monte Carlo-based density functional for one-dimensional Bose-Bose mixtures

Jakub Kopyciński·Luca Parisi·Nick G. Parker·Krzysztof Pawłowski
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Abstract

We propose and benchmark a Gross-Pitaevskii-like equation for two-component Bose mixtures with competing interactions in 1D. Our approach follows the density-functional theory with the energy functional based on the exact Quantum Monte Carlo (QMC) simulations. Our model covers, but goes beyond, the popular approach with the Lee-Huang-Yang corrections. We first benchmark our approach against available QMC data in all interaction regimes and then study dynamical properties, inaccessible by ab initio many-body simulations. Our analysis includes a study of monopole modes and reveals the presence of anomalous dark solitons.

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Jakub Kopyciński, Luca Parisi, Nick G. Parker, Krzysztof Pawłowski. 2023-01-11. Quantum Monte Carlo-based density functional for one-dimensional Bose-Bose mixtures. https://doi.org/10.1103/physrevresearch.5.023050

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