Low-temperature thermodynamics of the two-leg ladder Ising model with trimer rungs: A mystery explained

TL;DR

This paper explains the low-temperature behavior of a two-leg ladder Ising model with trimer rungs by linking it to a critical phenomenon in the standard Ising chain, revealing underlying physics and quasicritical exponents.

Contribution

It provides a new perspective on the low-temperature thermodynamics of the ladder Ising model, connecting it to well-known critical phenomena and clarifying previous mysterious observations.

Findings

Low-temperature behavior explained via critical phenomena

Emergence of power-law behavior with quasicritical exponents

Connection established between ladder model and standard Ising chain

Abstract

Recently, a surprising low-temperature behavior has been revealed in a two-leg ladder Ising model with trimer rungs (Weiguo Yin, arXiv:2006.08921). Motivated by these findings, we study this model from another perspective and demonstrate that the reported observations are related to a critical phenomenon in the standard Ising chain. We also discuss a related curiosity, namely, the emergence of a power-law behavior characterized by quasicritical exponents.