Coexistence of s-wave Superconductivity and Antiferromagnetism

TL;DR

This paper investigates a generalized Hubbard model revealing a first order phase transition between s-wave superconductivity and antiferromagnetism using projector Quantum Monte Carlo simulations.

Contribution

It introduces a new model with competing interactions and demonstrates the first order transition between two quantum phases.

Findings

First order transition observed between superconducting and antiferromagnetic phases.

Transition controlled by varying Hubbard U from attractive to repulsive.

Model provides insights into coexistence and competition of quantum orders.

Abstract

We study the phase diagram of a new model that exhibits a first order transition between s-wave superconducting and antiferromagnetic phases. The model, a generalized Hubbard model augmented with competing spin-spin and pair-pair interactions, was investigated using the projector Quantum Monte Carlo method. Upon varying the Hubbard $U$ from attractive to repulsive we find a first order phase transition between superconducting and antiferromagnetic states.