Bose-Einstein condensation vs. localization of bosonic quasiparticles in disordered weakly-coupled dimer antiferromagnets

TL;DR

This study explores how disorder affects the transition from insulator to superfluid in bosonic quasiparticles within weakly-coupled dimer antiferromagnets, revealing a Bose-glass phase caused by quasiparticle localization.

Contribution

It demonstrates the emergence of a Bose-glass phase due to disorder in a specific quantum magnetic system, combining theoretical analysis with realistic disorder effects.

Findings

Identification of a Bose-glass phase induced by disorder

Localization of quasiparticles in the Bose-glass phase

Impact of site dilution on the insulator-superfluid transition

Abstract

We investigate the field-induced insulator-to-superfluid transition of bosonic quasiparticles in $S=1/2$ weakly-coupled dimer antiferromagnets. In presence of realistic disorder due to site dilution of the magnetic lattice, we show that the system displays an extended Bose-glass phase characterized by the localization of the hard-core quasiparticles.