Managing Singular Kernels and Logarithmic Corrections in the Staggered Six-Vertex Model

TL;DR

This paper compares NLIE and ODE/IQFT methods for analyzing the spectral properties of the staggered six-vertex model, demonstrating high accuracy of asymptotic approaches even at small system sizes and addressing numerical stability.

Contribution

It introduces a unifying framework for NLIEs with singular and regular kernels, validating the ODE/IQFT approach for finite sizes and improving analysis techniques for lattice models.

Findings

NLIE and ODE/IQFT results differ by about O(L^{-2}) for large systems.

Validated the accuracy of asymptotic methods at small system sizes.

Provided stable numerical solutions for system sizes up to 10^{24}.

Abstract

In this paper, we investigate the spectral properties of the staggered six-vertex model with ${\cal Z}_2$ symmetry for arbitrary system sizes $L$ using non-linear integral equations (NLIEs). Our study is motivated by two key questions: what is the accuracy of results based on the ODE/IQFT correspondence in the asymptotic regime of large system sizes, and what is the optimal approach based on NLIE for analyzing the staggered six-vertex model? We demonstrate that the quantization conditions for low-lying primary and descendant states, derived from the ODE/IQFT approach in the scaling limit, are impressively accurate even for relatively small system sizes. Specifically, in the anisotropy parameter range $\pi/4 < \gamma < \pi/2$, the difference between NLIE and ODE/IQFT results for energy and quasi-momentum eigenvalues is of order $\mathcal{O}(L^{-2})$. Furthermore, we present a unifying framework for NLIEs, distinguishing between versions with singular and regular kernels. We provide a compact derivation of NLIE with a singular kernel, followed by an equivalent set with a regular kernel. We address the stability issues in numerical treatments and offer solutions to achieve high-accuracy results, validating our approach for system sizes ranging from $L=2$ to $L=10^{24}$. Our findings not only validate the ODE/IQFT approach for finite system sizes but also enhance the understanding of NLIEs in the context of the staggered six-vertex model. We hope the insights gained from this study have significant implications for resolving the spectral problem of other lattice systems with emergent non-compact degrees of freedom and provide a foundation for future research in this domain.