Dresden 2026 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 47: Frustrated Magnets II (joint session MA/TT)
TT 47.12: Vortrag
Mittwoch, 11. März 2026, 12:30–12:45, POT/0361
Dynamical heterogeneity and fractal subdiffusive transport in spin-ice — •Malte Bieringer1, Gianluca Teza1,2, Claudio Castelnovo3, and Roderich Moessner1 — 1Max-Planck-Institut für Physik komplexer Systeme, Nöthnitzer Straße 38, 01187 Dresden, Germany — 2Department of Physics, University of Trieste, Strada Costiera 11, 34136 Trieste, Italy — 3TCM Group, Cavendish Laboratory, University of Cambridge, Cambridge CB3 0HE, UK
Spin ice is a paradigmatic model that, despite its simplicity, enables the exploration of rich and robust emergent phenomena in topological magnets. Here we uncover a novel set of spin-ice phenomenology typically associated with vitrification processes in disordered systems.
We identify a pronounced peak in dynamical heterogeneity in a classical spin-ice model on the three-dimensional pyrochlore lattice, in the complete absence of disorder and - remarkably - in thermal equilibrium. At low temperatures, additional dynamical constraints emerge that confine the motion of magnetic monopole excitations to three-dimensional percolation clusters. This gives rise to ergodic subdiffusion, opposing conventional emergent hydrodynamics. The observed dynamical heterogeneity arises without disorder or ergodicity breaking, distinguishing it from conventional glasses and systems with Hilbert space fragmentation, suggesting a generic feature of topological magnets hosting deconfined quasiparticles.
Our results motivate the search for materials and artificial spin-ice realizations of this physics and propose higher-order dynamical correlations as a distinctive experimental signature of topological magnetism.
Keywords: Spin Ice; Dynamical Heterogeneity; Anomalous Diffusion; Fractal Criticality; Topological Magnets