New solutions to the $s\ell_q(2)$-invariant Yang-Baxter equations at roots of unity

TL;DR

This paper introduces new solutions to the $sl_q(2)$-invariant Yang-Baxter equations at roots of unity, exploring their associated quantum chain models and extending the analysis to related super-algebras.

Contribution

It presents novel $R$-matrix solutions at roots of unity using indecomposable representations, extending the understanding of quantum integrable models.

Findings

New $R$-matrix solutions at roots of unity.

Quantum chain models extend XXZ model at roots of unity.

Hamiltonians are generally non-Hermitian.

Abstract

We find new solutions to the Yang-Baxter equations with the $R$-matrices possessing $sl_q(2)$ symmetry at roots of unity, using indecomposable representations. The corresponding quantum one-dimensional chain models, which can be treated as extensions of the XXZ model at roots of unity, are investigated. We consider the case $q^4=1$. The Hamiltonian operators of these models as a rule appear to be non-Hermitian. Taking into account the correspondence between the representations of the quantum algebra $sl_q(2)$ and the quantum super-algebra $osp_t(1|2)$, the presented analysis can be extended to the latter case for the appropriate values of the deformation parameter.