Pattern Description of Quantum Phase Transitions in the Transverse Antiferromagnetic Ising Model with a Longitudinal Field

TL;DR

This paper investigates the complex quantum phase transitions in the transverse antiferromagnetic Ising model with a longitudinal field, revealing rich phase behavior and patterns that inform quantum simulations.

Contribution

It introduces a pattern-based approach to analyze the competing interactions and phases in the model, providing new insights into its quantum phase transitions.

Findings

Identification of patterns responsible for phase determination

Discovery of mixed-order phase behavior

Insights into the existence of disorder phases

Abstract

Despite of simplicity of the transverse antiferromagnetic Ising model with a uniform longitudinal field, its phases and involved quntum phase transitions (QPTs) are nontrivial in comparison to its ferromagnetic counterpart. For example, what is the nature of the mixed-order in such a model and does there exist a disorder phase? Here we use a pattern picture to explore the competitions between the antiferromagnetic Ising interaction, the transverse and longitudinal fields and uncover what kind of pattern takes responsibility of these three competing energy scales, thus determine the possible phases and their QPTs or crossovers. Our results not only unveil rich physics of this paradigmatic model, but also further stimulate quantum simulation by using current available experimental platforms.