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Title: Quenched dynamics of artificial colloidal spin ice

Abstract

Artificial spin ices are ideal frustrated model systems in which to explore or design emergent phenomena with unprecedented characterization of the constituent degrees of freedom. In square spin ice, violations of the ice rule are topological excitations essential to the kinetics of the system, providing an ideal test bed for studying the dynamics of such defects under varied quench rates. In this work we examine possible scenarios including the Kibble-Zurek mechanism and critical coarsening in colloidal square and hexagonal ice under quenches from a weakly interacting liquid state into a strongly interacting regime. As expected, for infinitely slow quenches, the system is free of defects such as monopoles, while for increasing quench rate, an increasing number of defects in the form of monopoles or grain boundaries remain in the sample. For square ice, we find regimes in which the defect population decreases as a power law with decreasing quench rate. A detailed scaling analysis shows that for a wide range of parameters, including quench rates that are accessible by experiments, the behavior is best described by critical coarsening rather than the Zurek-Kibble scenario if we assume that the equilibrium phase transition in this system is in the Ising universality class.more » The appearance of critical coarsening is likely due to the strong defect interactions in the colloidal ice system leading to relevant defect dynamics during the quench. For hexagonal ice we do not find evidence for a power-law decay in the defect density, which is consistent with the absence of an equilibrium phase transition in the hexagonal ice as well as a lack of critical coarsening.« less

Authors:
ORCiD logo; ORCiD logo; ; ; ORCiD logo
Publication Date:
Research Org.:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Laboratory Directed Research and Development (LDRD) Program
OSTI Identifier:
2325512
Alternate Identifier(s):
OSTI ID: 1734716
Report Number(s):
LA-UR-19-27840
Journal ID: ISSN 2643-1564; PPRHAI; 033433
Grant/Contract Number:  
892333218NCA000001; 89233218CNA000001
Resource Type:
Published Article
Journal Name:
Physical Review Research
Additional Journal Information:
Journal Name: Physical Review Research Journal Volume: 2 Journal Issue: 3; Journal ID: ISSN 2643-1564
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; domain walls; frustrated magnetism; nonequilibrium statistical mechanics; colloids; spin ice

Citation Formats

Libál, A., del Campo, A., Nisoli, C., Reichhardt, C., and Reichhardt, C. J. O. Quenched dynamics of artificial colloidal spin ice. United States: N. p., 2020. Web. doi:10.1103/PhysRevResearch.2.033433.
Libál, A., del Campo, A., Nisoli, C., Reichhardt, C., & Reichhardt, C. J. O. Quenched dynamics of artificial colloidal spin ice. United States. https://doi.org/10.1103/PhysRevResearch.2.033433
Libál, A., del Campo, A., Nisoli, C., Reichhardt, C., and Reichhardt, C. J. O. Thu . "Quenched dynamics of artificial colloidal spin ice". United States. https://doi.org/10.1103/PhysRevResearch.2.033433.
@article{osti_2325512,
title = {Quenched dynamics of artificial colloidal spin ice},
author = {Libál, A. and del Campo, A. and Nisoli, C. and Reichhardt, C. and Reichhardt, C. J. O.},
abstractNote = {Artificial spin ices are ideal frustrated model systems in which to explore or design emergent phenomena with unprecedented characterization of the constituent degrees of freedom. In square spin ice, violations of the ice rule are topological excitations essential to the kinetics of the system, providing an ideal test bed for studying the dynamics of such defects under varied quench rates. In this work we examine possible scenarios including the Kibble-Zurek mechanism and critical coarsening in colloidal square and hexagonal ice under quenches from a weakly interacting liquid state into a strongly interacting regime. As expected, for infinitely slow quenches, the system is free of defects such as monopoles, while for increasing quench rate, an increasing number of defects in the form of monopoles or grain boundaries remain in the sample. For square ice, we find regimes in which the defect population decreases as a power law with decreasing quench rate. A detailed scaling analysis shows that for a wide range of parameters, including quench rates that are accessible by experiments, the behavior is best described by critical coarsening rather than the Zurek-Kibble scenario if we assume that the equilibrium phase transition in this system is in the Ising universality class. The appearance of critical coarsening is likely due to the strong defect interactions in the colloidal ice system leading to relevant defect dynamics during the quench. For hexagonal ice we do not find evidence for a power-law decay in the defect density, which is consistent with the absence of an equilibrium phase transition in the hexagonal ice as well as a lack of critical coarsening.},
doi = {10.1103/PhysRevResearch.2.033433},
journal = {Physical Review Research},
number = 3,
volume = 2,
place = {United States},
year = {Thu Sep 17 00:00:00 EDT 2020},
month = {Thu Sep 17 00:00:00 EDT 2020}
}

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