title: Spin-charge separated solitons in a topological band insulator.
abstract: In this Letter 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 dynamic pi fluxes. (2) These solitons obey Bose statistics and their condensation triggers a phase transition from a spin Hall insulator to an easy-plane ferromagnet. (3) It suggests an alternative way to classify the Z2 topological band insulator without resorting to the sample boundary.
authors.affiliation: Department of Physics, University of California at Berkeley, Berkeley, California 94720, USA.
authors.forename: Ying
authors.initials: Y
authors.lastname: Ran
authors.forename: Ashvin
authors.initials: A
authors.lastname: Vishwanath
authors.forename: Dung-Hai
authors.initials: DH
authors.lastname: Lee