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The sl_2 loop algebra symmetry of the six-vertex model at roots of unity

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arxiv cond-mat/9912141 v2 pith:AYOC2732 submitted 1999-12-08 cond-mat.stat-mech hep-th

classification cond-mat.stat-mechhep-th
keywords algebradeltaloopmodelchaincomputedegeneraciesdegenerate
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abstract

We demonstrate that the six vertex model (XXZ spin chain) with $\Delta=(q+q^{-1})/2$ and $q^{2N}=1$ has an invariance under the loop algebra of $sl_2$ which produces a special set of degenerate eigenvalues. For $\Delta=0$ we compute the multiplicity of the degeneracies using Jordan Wigner techniques

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Cited by 2 Pith papers

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  1. Modular covariant torus partition functions of dense $A_1^{(1)}$ and dilute $A_2^{(2)}$ loop models

    math-ph 2025-01 conditional novelty 7.0 of 10

    For all coprime (p,p'), the dense A_1^(1) and dilute A_2^(2) loop models are conjectured to have identical torus conformal partition functions, supporting a common logarithmic universality class.

  2. Entangling Power: A Probe of Symmetry and Integrability in Quantum Many-Body Systems

    quant-ph 2026-05 unverdicted novelty 6.0 of 10

    Entangling power in Heisenberg spin chains shows a monotonic decrease with growing symmetry in small models, sharp dips at SU(2) and free-fermion points in finite chains, and vanishes at SU(2) points but maximizes at ...

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