Spin-charge Separated Solitons in a Topological Band Insulator
Abstract
In this paper we construct a simple, controllable, two dimensional model based on a topological band insulator. It has many attractive properties. (1) We obtain spin-charge separated solitons that are associated with π fluxes. (2) It suggests an alternative way to classify Z2 topological band insulator without resorting to the sample boundary. (3) When the π fluxes are dynamical variables, as in a correlated insulator with emergent gauge fluxes, these solitons are propagating bosonic excitations and their condensation triggers a phase transition into a planar ferromagnet.
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