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

TL;DR

This paper uses quantum Monte Carlo simulations to analyze the properties of low-dimensional dipolar Fermi gases, providing energy parameterizations that aid future theoretical and experimental research.

Contribution

It offers new parameterizations of energy data for 2D dipolar Fermi fluids, revealing the instability of itinerant ferromagnetism in these systems.

Findings

Itinerant ferromagnetism is unstable in the studied parameter space.

Provides energy parameterizations for dipolar Fermi gases.

Enables density functional theory applications for cold atom experiments.

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 $1/r^3$ form at long range, softened to a constant at short range. This study provides parameterizations 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 parameterization of the energy as a function of density will enable density functional theory to support experimental studies of inhomogeneous fermionic cold atom systems.