Fermionic spinon and holon statistics in the pyrochlore quantum spin liquid

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• Bruce Normand, Paul Scherrer Institute, Switzerland
• Thursday 19 May 2016, 14:15-15:15
• TCM Seminar Room, Cavendish Laboratory.

If you have a question about this talk, please contact Dr G Moller.

We prove that the insulating one-band Hubbard model on the pyrochlore lattice contains, for realistic parameters, an extended quantum spin-liquid phase. This is a three-dimensional spin liquid formed from a highly degenerate manifold of dimer-based states, which is a subset of the classical dimer coverings obeying the ice rules. It possesses spinon excitations, which are both massive and deconfined, and on doping it exhibits spin-charge separation. We demonstrate that the spinons have fermionic statistics, and further that the holons introduced by doping are also fermions. We explain the origin of this counterintuitive result and establish the connection of these emerging fermions with U(1) gauge fields, represented by strings, as anticipated by Levin and Wen.

This talk is part of the Theory of Condensed Matter series.

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