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

Lookup NU author(s): Dr Luca Parisi, Professor Nick ParkerORCiD

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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.

Publication metadata

Author(s): Kopycinski J, Parisi L, Parker NG, Pawlowski K

Publication type: Article

Publication status: Published

Journal: Physical Review Research

Year: 2023

Volume: 5

Issue: 2

Print publication date: 24/04/2023

Online publication date: 24/04/2023

Acceptance date: 07/04/2023

Date deposited: 24/04/2023

ISSN (electronic): 2643-1564

Publisher: American Physical Society

URL: https://doi.org/10.1103/PhysRevResearch.5.023050

DOI: 10.1103/PhysRevResearch.5.023050

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