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- W4386947812 abstract "Abstract We combine experiments and numerical simulations to investigate the low energy states and the emergence of topological defects in an artificial colloidal ice in the Cairo geometry. This type of geometry is characterized by a mixed coordination ( z ), with coexistence of both z = 3 and z = 4 vertices. We realize this particle ice by confining field tunable paramagnetic colloidal particles within a lattice of topographic double wells at a one to one filling using optical tweezers. By raising the interaction strength via an applied magnetic field, we find that the ice rule breaks down, and positive monopoles with charge <?CDATA $q = +2$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:mi>q</mml:mi> <mml:mo>=</mml:mo> <mml:mo>+</mml:mo> <mml:mn>2</mml:mn> </mml:math> accumulate in the z = 4 vertices and are screened by negative ones ( <?CDATA $q = -1$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:mi>q</mml:mi> <mml:mo>=</mml:mo> <mml:mo>−</mml:mo> <mml:mn>1</mml:mn> </mml:math> ) in the z = 3. The resulting, strongly coupled state remains disordered. Further, via analysis of the mean chirality associated to each pentagonal plaquette, we find that the disordered ensemble for this geometry is massively degenerate and it corresponds to a frustrated antiferrotoroid." @default.
- W4386947812 created "2023-09-23" @default.
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- W4386947812 date "2023-10-01" @default.
- W4386947812 modified "2023-10-09" @default.
- W4386947812 title "Ice Rule Breakdown and frustrated antiferrotoroidicity in an artificial colloidal Cairo ice" @default.
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- W4386947812 doi "https://doi.org/10.1088/1367-2630/acfc60" @default.
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