Emergent Coulombic criticality and Kibble-Zurek scaling in a topological magnet

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• Claudio Castelnovo - Cavendish Laboratory
• Wednesday 27 January 2016, 14:15-15:15
• MR2, Centre for Mathematical Sciences.

If you have a question about this talk, please contact Mike Blake.

When a classical system is driven through a continuous phase transition, its nonequilibrium response is universal and exhibits Kibble-Zurek scaling. We explore this dynamical scaling in the context of a three-dimensional topological magnet with fractionalized excitations, namely, the liquid-gas transition of the emergent mobile magnetic monopoles in dipolar spin ice. Using field-mixing and finite-size scaling techniques, we place the critical point of the liquid-gas line in the three-dimensional Ising universality class. We then demonstrate Kibble-Zurek scaling for sweeps of the magnetic field through the critical point. Unusually slow microscopic time scales in spin ice offer a unique opportunity to detect this universal nonequilibrium physics within current experimental capability.

This talk is part of the Theoretical Physics Colloquium series.

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