The quantum Newman-Moore model in a longitudinal field

TL;DR

This paper investigates the phase diagram of the quantum Newman-Moore model with a longitudinal field, revealing frustrated phases, phase transitions, and potential topological order using advanced computational techniques.

Contribution

It provides the first detailed analysis of the qTPMz phase diagram, identifying frustrated phases, magnetization plateaus, and connections to Rydberg blockade and topological order.

Findings

Identification of frustrated phases breaking translational symmetry.

Discovery of magnetization plateaus and their degeneracies.

Evidence of $ ext{Z}_2$ topological order in certain phases.

Abstract

We study the quantum Newman-Moore model, or quantum triangular plaquette model (qTPM), in the presence of a longitudinal field (qTPMz). We present evidence that indicates that the ground state phase diagram of the qTPMz includes various frustrated phases breaking translational symmetries, dependent on the specific sequence of system sizes used to take the large-size limit. This phase diagram includes the known first-order phase transition of the qTPM, but also additional first-order transitions due to the frustrated phases. Using the average longitudinal magnetization as an order parameter, we analyze the magnetization plateaus that characterize the ground state phases, describe their degeneracies, and obtain the qTPMz phase diagram using classical transfer matrix and quantum matrix product state techniques. We identify a region of parameter space which can be effectively described by a Rydberg blockade model on the triangular lattice and also find indications of $\mathbb{Z}_2$ topological order connecting the quantum paramagnetic and classical frustrated phases.