Critical theories of phase transition between symmetry protected topological states and their relation to the gapless boundary theories

Abstract

Symmetry protected topological states (SPTs) have the same symmetry and the phase transition between them are beyond Landau's symmetry breaking formalism. In this paper we study (1) the critical theory of phase transition between trivial and non-trivial SPTs, and (2) the relation between such critical theory and the gapless boundary theory of SPTs. Based on examples of SO(3) and SU(2) SPTs, we propose that under appropriate boundary condition the critical theory contains the delocalized version of the boundary excitations. In addition, we prove that the boundary theory is the critical theory spatially confined between two SPTs. We expect these conclusions to hold in general and, in particular, for discrete symmetry groups as well.

16 pages, 7 figures

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• Classification of topological insulators and superconductors in three spatial dimensions
• Quantum Phase Transition between Integer Quantum Hall States of Bosons
• Symmetry protected Spin Quantum Hall phases in 2-Dimensions

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