paper

Topological phases from higher gauge symmetry in 3+1D

arXiv:1606.06639 · doi:10.1103/PhysRevB.95.155118

Abstract

We propose an exactly solvable Hamiltonian for topological phases in dimensions utilising ideas from higher lattice gauge theory, where the gauge symmetry is given by a finite 2-group. We explicitly show that the model is a Hamiltonian realisation of Yetter's homotopy 2-type topological quantum field theory whereby the groundstate projector of the model defined on the manifold is given by the partition function of the underlying topological quantum field theory for . We show that this result holds in any dimension and illustrate it by computing the ground state degeneracy for a selection of spatial manifolds and 2-groups. As an application we show that a subset of our model is dual to a class of Abelian Walker-Wang models describing dimensional topological insulators.

28 pages, 4 figures

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