Magnetodipolar interaction and quasiparticles delocalization in disordered quantum magnets

TL;DR

This paper demonstrates that long-range magnetodipolar interactions can induce delocalization of quasiparticles in disordered three-dimensional quantum magnets, leading to sub-diffusive dynamics, contrasting the usual localization in such systems.

Contribution

It introduces the concept that magnetodipolar interactions can cause quasiparticle delocalization in disordered quantum magnets, a novel insight extending understanding of excitations in these materials.

Findings

Magnetodipolar interactions lead to quasiparticle delocalization.

Eigenmode occupation scales with system size.

System exhibits sub-diffusive dynamics.

Abstract

It is well-known that disordered quantum magnets usually host localized elementary excitations in gapped phases. Here we show that long-range magnetodipolar interaction can lead to quasiparticles delocalization in the three-dimensional case, similarly to the phenomenon previously described for localized vibrational modes in disordered solids. Employing renormalization group-like ideas, the average eigenmode occupation number is found to scale with the system size, which also leads to sub-diffusive dynamical properties of the system.