Bose-Glass Phases in Disordered Quantum Magnets

TL;DR

This paper uses quantum Monte Carlo simulations to identify a Bose-Glass phase in disordered quantum magnets, characterized by localized excitations and finite compressibility, during magnetic field-induced transitions.

Contribution

It provides the first detailed numerical evidence for the Bose-Glass phase in disordered quantum magnets using zero-temperature quantum Monte Carlo methods.

Findings

Identification of the Bose-Glass phase in disordered quantum magnets.

Localization of field-induced triplons causes glassiness.

Finite compressibility observed in the disordered phase.

Abstract

In disordered spin systems with antiferromagnetic Heisenberg exchange, transitions into and out of a magnetic-field-induced ordered phase pass through a unique regime. Using quantum Monte Carlo simulations to study the zero-temperature behavior, these intermediate regions are determined to be a Bose-Glass phase. The localization of field-induced triplons causes a finite compressibility and hence glassiness in the disordered phase.