{
  "abstract": "We study ultradilute $^{39}$K Bose-Bose bulk mixtures and droplets in an external harmonic potential that confines them in one spatial direction towards the two-dimensional (2D) limit. Equations of state for several confinements are obtained with quantum Monte Carlo (QMC) at $T=0$, using interaction potentials that include information on the $s$-wave scattering length $a$ and the effective range $r_{\\rm eff}$. Performing the calculations using two different interaction potential models we have determined the range of confinements for which equations of state are universal in terms of $a$ and $r_{\\rm eff}$. Based on the QMC equation of state, we develop a 2D QMC density functional for each confinement strength and use it together with the local density approximation to determine properties of the self-bound drops. For moderate squeezing, energies and droplet profiles obtained using the 2D QMC functional agree well with those obtained using 3D functionals, while offering a substantial reduction in computational cost, and a consistent approach in crossover to 2D. Noticeably, our results approach 2D mean-field (MF) + Lee-Huang-Yang (LHY) predictions only for the most strongly confined systems for which universality in terms of $a$ and $r_{\\rm eff}$ is observed. This implies a very narrow range of confinements for which 2D LHY functionals are applicable, which affects the study of vortices using 2D functionals.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2607.25558",
  "author_total": 5,
  "authors": [
    {
      "name": "Leandra Vranješ Markić"
    },
    {
      "name": "Ivan Poparić"
    },
    {
      "name": "Krešimir Dželalija"
    },
    {
      "name": "Petar Stipanović"
    },
    {
      "name": "Jordi Boronat"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/dzf1y8s3j67c7.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2607.25558",
  "fulltext_url": null,
  "id": "dzf1y8s3j67c7",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2607.25558",
  "language": null,
  "licence": "CC-BY-NC-SA-4.0",
  "licence_label": "CC BY-NC-SA 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by-nc-sa/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "cond-mat.quant-gas"
    ],
    [
      "openalex",
      "3107|Cold Atom Physics and Bose-Einstein Condensates"
    ]
  ],
  "openalex": "W7171627908",
  "pdf_url": "https://arxiv.org/pdf/2607.25558",
  "pmcid": null,
  "pmid": null,
  "published": "2026-11-05",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/dzf1y8s3j67c7.ris",
  "sources": [
    {
      "first_seen": "2026-11-06T18:21:30Z",
      "native_id": "2607.25558",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2607.25558"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.quant-gas",
      "subfield": "amo"
    },
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.quant-gas",
      "subfield": "condensed-matter"
    }
  ],
  "title": "Dimensional crossover in ultradilute Bose-Bose liquid mixtures",
  "title_text": "Dimensional crossover in ultradilute Bose-Bose liquid mixtures",
  "type": "preprint",
  "updated_at": "2026-11-09T00:20:33Z",
  "url": "https://research.draconitic.com/paper/dzf1y8s3j67c7",
  "venue": "arXiv",
  "versions": [
    {
      "doi": "10.1103/zpp2-x8y5",
      "pid": "6bdjeeymry9r4",
      "relation": "published-as",
      "title": "Dimensional crossover in ultradilute Bose-Bose liquid mixtures",
      "venue": "Physical Review Research"
    }
  ]
}