Magnetodipolar interaction and quasiparticles delocalization in disordered quantum magnets
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.