Topological phases from higher gauge symmetry in 3+1 dimensions

Jun 21, 2016
21 pages
Published in:
  • Phys.Rev.B 95 (2017) 15, 155118
  • Published: Apr 13, 2017
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Abstract: (APS)
We propose an exactly solvable Hamiltonian for topological phases in 3+1 dimensions utilizing 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 realization of Yetter's homotopy 2-type topological quantum field theory whereby the ground-state projector of the model defined on the manifold M3 is given by the partition function of the underlying topological quantum field theory for M3×[0,1]. 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 3+1 dimensional topological insulators.
Note:
  • 28 pages, 4 figures
  • phase: topological
  • symmetry: gauge
  • Hamiltonian
  • topological insulator
  • lattice field theory
  • partition function
  • ground state
  • homotopy
  • any-dimensional