The BCS-BEC crossover and superconductivity in a lattice fermion model with hard core repulsion

TL;DR

This paper investigates the BCS-BEC crossover in a 3D lattice fermion model with hard core repulsion and intersite attraction, analyzing phase diagrams and key physical quantities at zero temperature.

Contribution

It introduces a detailed analysis of the BCS-BEC crossover in a lattice model with infinite on-site repulsion and intersite attraction, providing new insights into phase behavior and physical properties.

Findings

Identified density-driven and attraction-strength-driven crossover mechanisms.

Mapped the ground state phase diagram for the model.

Analyzed key physical quantities like chemical potential and coherence length.

Abstract

We have considered the BCS-BEC crossover at T=0 in the framework of a lattice fermion model (the extended Hubbard model). We have analyzed the case of on-site hard core repulsion ($U=\infty$) and intersite attraction ($W<0$) in a 3D system with extended s-wave pairing symmetry. The mechanisms of density-driven and attraction-strength-driven crossover have been analyzed. We have obtained the ground state phase diagram. The analyzed quantities are: chemical potential, order parameter, coherence length and fraction of condensed particles.