RSOS Quantum Chains Associated with Off-Critical Minimal Models and ${\mathbb{Z}}_n$ Parafermions

Abstract

We consider the ${\phi }_{1,3}$ off-critical perturbation $\mathcal{M}(m,m^{\prime };t)$ of the general non-unitary minimal models where $2\le m\le m^{\prime }$ and $m,m^{\prime }$ are coprime and $t$ measures the departure from criticality corresponding to the ${\phi }_{1,3}$ integrable perturbation. We view these models as the continuum scaling limit in the ferromagnetic Regime III of the Forrester-Baxter Restricted Solid-On-Solid (RSOS) models on the square lattice. We also consider the RSOS models in the antiferromagnetic Regime II related in the continuum scaling limit to ${\mathbb{Z}}_n$ parfermions with $n=m^{\prime }-2$. Using an elliptic Yang-Baxter algebra of planar tiles encoding the allowed face configurations, we obtain the Hamiltonians of the associated quantum chains defined as the logarithmic derivative of the transfer matrices with periodic boundary conditions. The transfer matrices and Hamiltonians act on a vector space of paths on the $A_{m^{\prime }-1}$ Dynkin diagram whose dimension is counted by generalized Fibonacci numbers.

arXiv comment18 pages

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• Yang-Baxter Solution of Dimers as a Free-Fermion Six-Vertex Model
• Fused RSOS Lattice Models as Higher-Level Nonunitary Minimal Cosets
• Weak ergodicity breaking with isolated integrable sectors
• Integrable models on Rydberg atom chains
• Yang-Baxter Integrable Dimers on a Strip
• On correlation functions in models related to the Temperley-Lieb algebra