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Quantum Monte Carlo study of low-dimensional Fermi fluids of dipolar atoms

Clio Johnson1,*, Neil D. Drummond1, James P. Hague2, and Calum MacCormick2

  • *Contact author: d.k.johnson@lancaster.ac.uk, she/her/hers
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Phys. Rev. A 113, 013313 – Published 9 January, 2026

DOI: https://doi.org/10.1103/gx6b-t48r

Abstract

Fermionic cold atoms in optical traps provide viable quantum simulators of correlation effects in electronic systems. For dressed Rydberg atoms in two-dimensional traps with out-of-plane dipole moments, a realistic model of the pairwise interaction is of repulsive dipolar 1/r3 form at long range, softened to a constant at short range. This study provides parametrizations of fixed-node diffusion Monte Carlo energy data for ferromagnetic (one-component) and paramagnetic (two-component) two-dimensional homogeneous Fermi fluids of interacting dipolar atoms. We find itinerant ferromagnetism to be unstable within our parameter spaces for dipolar interactions both with and without softening. Our parametrization of the energy as a function of density will enable density functional theory to support experimental studies of inhomogeneous fermionic cold-atom systems.

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Phys. Rev. A 113, 013313– Published 9 January, 2026
  • Received 21 October 2025
  • Accepted 3 December 2025
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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