Extended integrability regime for the supersymmetric U model

TL;DR

This paper extends the supersymmetric U model for correlated electrons, demonstrating its integrability via the Quantum Inverse Scattering Method and providing explicit energy expressions from the Bethe ansatz.

Contribution

It introduces an extended version of the supersymmetric U model and proves its integrability using a novel R-matrix without the difference property.

Findings

Model is integrable via Quantum Inverse Scattering Method

Provides Bethe ansatz energy expressions

Discusses symmetry properties of the model

Abstract

An extension of the supersymmetric U model for correlated elctrons is given and integrability is established by demonstrating that the model can be constructed through the Quantum Inverse Scattering Method using an R-matrix without the difference property. Some general symmetry properties of the model are discussed and from the Bethe ansatz solution an expression for the energies is presented.