String Phase in an Artificial Spin Ice.

Autor: Zhang X; Department of Applied Physics, Yale University, New Haven, CT, 06511, USA.; Department of Physics, University of Illinois at Urbana-Champaign, Urbana, IL, 61801, USA.; Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, IL, 61801, USA., Duzgun A; Theoretical Division and Center for Nonlinear Studies, MS B258, Los Alamos National Laboratory, Los Alamos, NM, 87545, USA., Lao Y; Department of Physics, University of Illinois at Urbana-Champaign, Urbana, IL, 61801, USA.; Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, IL, 61801, USA., Subzwari S; Department of Applied Physics, Yale University, New Haven, CT, 06511, USA., Bingham NS; Department of Applied Physics, Yale University, New Haven, CT, 06511, USA., Sklenar J; Department of Physics, University of Illinois at Urbana-Champaign, Urbana, IL, 61801, USA.; Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, IL, 61801, USA.; Department of Physics and Astronomy, Wayne State University, Detroit, MI, 48201, USA., Saglam H; Department of Applied Physics, Yale University, New Haven, CT, 06511, USA., Ramberger J; Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, MN, 55455, USA., Batley JT; Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, MN, 55455, USA., Watts JD; Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, MN, 55455, USA.; School of Physics and Astronomy, University of Minnesota, Minneapolis, MN, 55455, USA., Bromley D; Department of Physics, University of Liverpool, Liverpool, L69 3BX, United Kingdom., Chopdekar RV; Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA., O'Brien L; Department of Physics, University of Liverpool, Liverpool, L69 3BX, United Kingdom., Leighton C; Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, MN, 55455, USA., Nisoli C; Theoretical Division and Center for Nonlinear Studies, MS B258, Los Alamos National Laboratory, Los Alamos, NM, 87545, USA., Schiffer P; Department of Applied Physics, Yale University, New Haven, CT, 06511, USA. peter.schiffer@yale.edu.; Department of Physics, University of Illinois at Urbana-Champaign, Urbana, IL, 61801, USA. peter.schiffer@yale.edu.; Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, IL, 61801, USA. peter.schiffer@yale.edu.; Department of Physics, Yale University, New Haven, CT, 06511, USA. peter.schiffer@yale.edu.
Jazyk: angličtina
Zdroj: Nature communications [Nat Commun] 2021 Nov 11; Vol. 12 (1), pp. 6514. Date of Electronic Publication: 2021 Nov 11.
DOI: 10.1038/s41467-021-26734-6
Abstrakt: One-dimensional strings of local excitations are a fascinating feature of the physical behavior of strongly correlated topological quantum matter. Here we study strings of local excitations in a classical system of interacting nanomagnets, the Santa Fe Ice geometry of artificial spin ice. We measured the moment configuration of the nanomagnets, both after annealing near the ferromagnetic Curie point and in a thermally dynamic state. While the Santa Fe Ice lattice structure is complex, we demonstrate that its disordered magnetic state is naturally described within a framework of emergent strings. We show experimentally that the string length follows a simple Boltzmann distribution with an energy scale that is associated with the system's magnetic interactions and is consistent with theoretical predictions. The results demonstrate that string descriptions and associated topological characteristics are not unique to quantum models but can also provide a simplifying description of complex classical systems with non-trivial frustration.
(© 2021. The Author(s).)
Databáze: MEDLINE
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