New integrable version of the degenerate supersymmetric t-J model

TL;DR

This paper introduces a novel integrable variant of the degenerate supersymmetric t-J model allowing up to two electrons per site, with correlated hopping interactions, solved exactly via the coordinate Bethe ansatz.

Contribution

It presents a new integrable model that relaxes the single occupancy restriction and establishes a correlated hopping mechanism, solved exactly using Bethe ansatz techniques.

Findings

Model allows up to two electrons per site.

Hopping interaction correlates with neighboring site densities.

Exact solution obtained via coordinate Bethe ansatz.

Abstract

A new integrable version of the degenerate supersymmetric t-J model is proposed. In this formulation instead of restricting single occupancy of electrons at each lattice site we may have up to two electrons at each site. As a requirement of exact integrability the hopping interaction turns out to be correlated with the density of electrons in the neighboring sites. The exact solution of the model is obtained through the coordinate Bethe anzatz.