Quantum Field Induced Orderings in Fully Frustrated Ising Spin Systems

TL;DR

This paper investigates how quantum fluctuations, introduced by a transverse field, induce and enhance orderings in fully frustrated Ising spin systems, demonstrating phenomena like quantum field induced order and reentrant behavior.

Contribution

It provides the first detailed analysis of quantum field induced ordering and reentrant phenomena in fully frustrated Ising models, highlighting the role of quantum fluctuations.

Findings

Quantum fluctuations enlarge sublattice correlations at zero temperature.

Transverse field enhances solid order in frustrated systems.

Reentrant behavior induced by quantum fluctuations observed.

Abstract

We study ordering mechanisms which are induced by the quantum fluctuation in fully frustrated Ising spin systems. Since there are many degenerated states in frustrated systems, "order by thermal disorder" often takes place due to a kind of entropy effect. To consider "order by quantum disorder" in fully frustrated Ising spin systems, we apply transverse field as quantum fluctuation. There exists a ferromagnetic correlation in each sublattice. The sublattice correlation at zero temperature is enlarged due to transverse field. The quantum fluctuation enhances the solid order at zero temperatures. This is an example of quantum field induced ordering in fully frustrated systems. We also study a case in which the transverse field induces a reentrant behavior as another type of order by quantum disorder, and compare correspondent cases in the classical systems.