Kramers-Wannier duality from conformal defects
arXiv:cond-mat/0404051 · doi:10.1103/PhysRevLett.93.070601
Abstract
We demonstrate that the fusion algebra of conformal defects of a two-dimensional conformal field theory contains information about the internal symmetries of the theory and allows one to read off generalisations of Kramers-Wannier duality. We illustrate the general mechanism in the examples of the Ising model and the three-states Potts model.
8 pages, 4 figures; v2: version published in PRL