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arXiv:2212.09514 · Nuclear Physics B

On extension of the Yang-Baxter equation and the fermionic R-operator

A. Melikyan

Published Dec 22, 2022• 2 citations
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Abstract

We consider the fermionic R-operator based on Bazhanov-Stroganov's three-parameter elliptic parametrization of the free fermion model, and find the most general solution of the related tetrahedral Zamolodchikov algebra in the trigonometric limit for an arbitrary set of parameters. This allows to construct an extension of the R-operator and the corresponding Yang-Baxter equation, which are of the difference type in one of the spectral parameters.

DOI
10.1016/j.nuclphysb.2022.116062

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We consider the fermionic R-operator based on Bazhanov-Stroganov's three-parameter elliptic parametrization of the free fermion model, and find the most general solution of the related tetrahedral Zamolodchikov algebra in the trigonometric limit for an arbitrary set of parameters. This allows to construct an extension of the R-operator and the corresponding Yang-Baxter equation, which are of the difference type in one of the spectral parameters.
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Bootstrapping Fermionic RRR-operators with Decorated Yang--Baxter Equations
Integrating infinitesimal generators of local dynamics into finite-time evolution is generally harder than extracting a local Hamiltonian from a quantum gate. For integrable one-dimensional quantum many-body systems, a recent bootstrap constructs one-parameter RRR-operators directly from Hamiltonians satisfying the Reshetikhin condition. However, this condition excludes important models such as the Hubbard model, whose two-parameter RRR-operator was obtained by Shastry from a decorated Yang--Baxter equation obeyed by its free-fermion sector. Here, I extend the bootstrap to RRR-operators constrained by both the ordinary and decorated Yang--Baxter equations. Their joint expansion produces additional Hamiltonian-level necessary conditions and recursively determines candidate higher-order terms, subject to two-site locality at each order. I also derive compatibility and factorization conditions under which a Shastry-type superposition solves the RLLRLLRLL relation after deformation by an onsite involution. The construction recovers the known two-parameter RRR-operators of the Hubbard and XYh models, whose full Yang--Baxter equations follow from established tetrahedral Zamolodchikov algebra relations. For a superconducting Hubbard deformation, the scalar equations are generically incompatible, placing it outside this framework. These results provide diagnostics and a systematic route to fermionic RRR-operators beyond the Reshetikhin condition. General sufficiency, convergence of the formal bootstrap, and sufficiency of the deformation conditions remain open.