Classical topological order in the kinetics of artificial spin ice

• DOI: 10.1038/s41567-018-0077-0
• Publication Date: 2018-03-29T22:16:09Z
• Authors: Yuyang Lao; Francesco Caravelli; Mohammed Sheikh; Joseph Sklenar; Daniel Gardeazabal; Justin D. Watts; Alan M. Albrecht; Andreas Scholl; Karin Dahmen; Cristiano Nisoli; Peter Schiffer
• Keywords: Spin ice; Realization (probability); Nanomagnet; Ergodicity

Systems of interacting nanomagnets known as artificial spin ice1–4 have allowed the design, realization and study of geometrically frustrated exotic collective states5–10 that are absent in natural magnets. We have experimentally measured11,12 the thermally induced moment fluctuations in the Shakti geometry of artificial spin ice. We show that its disordered moment configuration is a topological phase described by an emergent dimer-cover model13 with excitations that can be characterized as topologically charged defects. Examination of the low-energy dynamics of the system confirms that these effective topological charges have long lifetimes associated with their topological protection, that is, they can be created and annihilated only as charge pairs with opposite sign and are kinetically constrained. This manifestation of classical topological order14–19 demonstrates that geometrical design in nanomagnetic systems can lead to emergent, topologically protected kinetics that can limit pathways to equilibration and ergodicity. Experiments on the Shakti geometry of artificial spin ice show that its low-energy excitations are topologically protected, and that an emergent classical topological order influences the ergodicity and equilibration of this nanomagnetic system.