An Upsilon Point in a Spin Model

TL;DR

This paper provides analytical evidence for an upsilon point, a complex infinite checkerboard phase, in a spin model's ground state, using interface interaction calculations via inverse anisotropy expansion.

Contribution

It introduces the concept of an upsilon point in spin models and analyzes its structure through a novel analytical approach.

Findings

Identification of an upsilon point in the model's phase diagram

Analytical characterization of the checkerboard structure

Methodology using inverse anisotropy expansion

Abstract

We present analytic evidence for the occurrence of an upsilon point, an infinite checkerboard structure of modulated phases, in the ground state of a spin model. The structure of the upsilon point is studied by calculating interface--interface interactions using an expansion in inverse spin anisotropy.