Walker-Wang models and axion electrodynamics
Research output: Contribution to journal › Article › peer-review
Colleges, School and Institutes
We connect a family of gauge theories (Maxwell theories with a magnetoelectric coupling θ=2πk,k∈Z) to the family of 3D topological lattice models introduced by Walker and Wang. In particular, we show that the lattice Hamiltonians capture a certain strong-coupling limit of these gauge theories, in which the system enters a gapped (confined) phase. We discuss the relationship between the topological order exhibited by certain of these lattice Hamiltonians and the characteristic electromagnetic response of the symmetry-protected bosonic topological insulator.
|Number of pages||23|
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - 26 Jan 2015|