Classical topological order in the kinetics of artificial spin ice

Yuyang Lao, Francesco Caravelli, Mohammed Sheikh, Joseph Sklenar, Daniel Gardeazabal, Justin D. Watts, Alan M. Albrecht, Andreas Scholl, Karin Dahmen, Cristiano Nisoli, Peter Schiffer

Research output: Contribution to journalArticle

Abstract

Systems of interacting nanomagnets known as artificial spin ice 1-4 have allowed the design, realization and study of geometrically frustrated exotic collective states 5-10 that are absent in natural magnets. We have experimentally measured 11,12 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 model 13 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 order 14-19 demonstrates that geometrical design in nanomagnetic systems can lead to emergent, topologically protected kinetics that can limit pathways to equilibration and ergodicity.

Original languageEnglish (US)
Pages (from-to)723-727
Number of pages5
JournalNature Physics
Volume14
Issue number7
DOIs
StatePublished - Jul 1 2018

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Data from: Classical Topological Order in the Kinetics of Artificial Spin Ice

    Lao, Y. (Creator), Caravelli, F. (Creator), Sheikh, M. (Creator), Sklenar, J. (Creator), Gardeazabal, D. (Creator), Watts, J. D. (Creator), Albrecht, A. M. (Creator), Scholl, A. (Creator), Dahmen, K. A. (Creator), Nisoli, C. (Creator) & Schiffer, P. E. (Creator), University of Illinois at Urbana-Champaign, Jun 20 2018

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    Cite this

    Lao, Y., Caravelli, F., Sheikh, M., Sklenar, J., Gardeazabal, D., Watts, J. D., Albrecht, A. M., Scholl, A., Dahmen, K., Nisoli, C., & Schiffer, P. (2018). Classical topological order in the kinetics of artificial spin ice. Nature Physics, 14(7), 723-727. https://doi.org/10.1038/s41567-018-0077-0