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Non-hermitian integrable systems from constant non-invertible solutions of the Yang-Baxter equation

High Energy Physics - Theory 2025-06-06 v1 Statistical Mechanics Mathematical Physics math.MP Exactly Solvable and Integrable Systems

Abstract

We construct invertible spectral parameter dependent Yang-Baxter solutions (RR-matrices) by Baxterizing constant non-invertible Yang-Baxter solutions. The solutions are algebraic (representation independent). They are constructed using supersymmetry (SUSY) algebras. The resulting RR-matrices are regular leading to local non-hermitian Hamiltonians written in terms of the SUSY generators. As particular examples we Baxterize the 4×44\times 4 constant non-invertible solutions of Hietarinta leading to nearest-neighbor Hamiltonians. On comparing with the literature we find two of the models are new. Apart from being non-hermitian, many of them are also non-diagonalizable with interesting spectrums. With appropriate representations of the SUSY generators we obtain spin chains in all local Hilbert space dimensions.

Keywords

Cite

@article{arxiv.2503.08109,
  title  = {Non-hermitian integrable systems from constant non-invertible solutions of the Yang-Baxter equation},
  author = {Somnath Maity and Pramod Padmanabhan and Vladimir Korepin},
  journal= {arXiv preprint arXiv:2503.08109},
  year   = {2025}
}

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36 pages + references