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Defect Dynamics in Artificial Colloidal Ice: Real-Time Observation, Manipulation, and Logic Gate

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We study the defect dynamics in a colloidal spin ice system realized by filling a square lattice of topographic double well islands with repulsively interacting magnetic colloids. We focus on the contraction of defects in the ground state, and contraction or expansion in a metastable biased state. Combining real-time experiments with simulations, we prove that these defects behave like emergent topological monopoles obeying a Coulomb law with an additional line tension. We further show how to realize a completely resettable 'nor' gate, which provides guidelines for fabrication of nanoscale logic devices based on the motion of topological magnetic monopoles.

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Articles publicats en revistes (Física de la Matèria Condensada)

# metadata.dc.title[].value
Defect Dynamics in Artificial Colloidal Ice: Real-Time Observation, Manipulation, and Logic Gate