Spin-charge Separated Solitons in a Topological Band Insulator

Details Spin-charge Separated Solitons in a Topological Band Insulator Spin-charge Separated Solitons in a Topological Band Insulator

2008-01-04

arxiv.org/abs/0801.0627v2

Phys. Rev. Lett. 101, 086801 (2008)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

10.1103/PhysRevLett.101.086801

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 $\pi$ fluxes. (2) It suggests an alternative way to classify $Z_2$ topological band insulator without resorting to the sample boundary. (3) When the $\pi$ 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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