Comparison between a diagrammatic theory for the BCS-BEC crossover and Quantum Monte Carlo results

TL;DR

This paper compares a diagrammatic theoretical approach with Quantum Monte Carlo simulations to study the BCS-BEC crossover, finding strong agreement in predictions for chemical potential and excitation gap at zero temperature.

Contribution

It introduces a diagrammatic theory for the BCS-BEC crossover and validates it against Quantum Monte Carlo results, demonstrating its accuracy.

Findings

Remarkable agreement between theory and QMC results

Accurate predictions for chemical potential and excitation gap

Validates the diagrammatic approach for superfluid phase

Abstract

Predictions for the chemical potential and the excitation gap recently obtained by our diagrammatic theory for the BCS-BEC crossover in the superfluid phase are compared with novel Quantum Monte Carlo results at zero temperature now available in the literature. A remarkable agreement is found between the results obtained by the two approaches