Staggered long-range order for diluted quantum spin models

TL;DR

This paper investigates a diluted quantum XY spin model and discovers conditions under which staggered occupancy phases emerge at low temperatures, despite expectations of dense occupation.

Contribution

It introduces the concept of staggered long-range order in a diluted quantum spin model, revealing new phase behavior not previously documented.

Findings

Staggered occupancy phases occur at low temperatures.

Dilution influences phase structure in quantum XY models.

Conditions for long-range order are identified.

Abstract

We study an annealed site diluted quantum XY model with spin $S\in \frac{1}{2}\mathbb{N}$. We find regions of the parameter space where, in spite of being a priori favourable for a densely occupied state, phases with staggered occupancy occur at low temperatures.