Expansions about Free-Fermion Models

TL;DR

The paper introduces a technique to expand the free energy of six-vertex models around free-fermion points, verifying Coulomb gas predictions about singularities in the staggered F-model.

Contribution

A new method for expanding free energy in six-vertex models near free-fermion points is developed and applied to verify theoretical predictions.

Findings

Validated Coulomb gas prediction for the staggered F-model

Provided a systematic expansion technique for free energy

Confirmed behavior of leading singularity in specific models

Abstract

A simple technique for expanding the free energy of general six-vertex models about free-fermion points is introduced. This technique is used to verify a Coulomb gas prediction about the behavior of the leading singularity in the free energy of the staggered F-model at zero staggered field.