Energy of strongly attractive Bose-Fermi mixtures

TL;DR

This paper compares theoretical and computational approaches to determine the energy of strongly attractive Bose-Fermi mixtures, focusing on the molecular limit where molecules behave like Fermi-Fermi mixtures.

Contribution

It demonstrates that approximate theories recover the expected molecular limit and compares T-matrix, Variational, and Fixed-Node Quantum Monte Carlo methods for energy calculations.

Findings

Approximate theories align with expected molecular limit expressions.

T-matrix approach results are consistent with Quantum Monte Carlo methods.

The study validates theoretical models against computational benchmarks.

Abstract

We discuss how approximate theories for Bose-Fermi mixtures recover in the molecular limit the expected expression for Fermi-Fermi mixtures of molecules and unpaired fermions. In particular, we compare the energy of the system resulting from a T-matrix diagrammatic approach with that obtained with Variational and Fixed-Node Diffusion Quantum Monte Carlo methods.