Anyonic Symmetries and Topological Defects in Abelian Topological Phases: an application to the $ADE$ Classification

Abstract

We study symmetries and defects of a wide class of two dimensional Abelian topological phases characterized by Lie algebras. We formulate the symmetry group of all Abelian topological field theories. The symmetries relabel quasiparticles (or anyons) but leave exchange and braiding statistics unchanged. Within the class of $ADE$ phases in particular, these anyonic symmetries have a natural origin from the Lie algebra. We classify one dimensional gapped phases along the interface between identical topological states according to symmetries. This classification also applies to gapped edges of a wide range of fractional quantum spin Hall(QSH) states. We show that the edge states of the $ADE$ QSH systems can be gapped even in the presence of time reversal and charge conservation symmetry. We distinguish topological point defects according to anyonic symmetries and bound quasiparticles. Although in an Abelian system, they surprisingly exhibit non-Abelian fractional Majorana-like characteristics from their fusion behavior.

18 pages, 7 figures, (v2 has improved organization, various improvements, and new discussion of vortex defects)

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Cited by in corpus (7)

• Theory of Twist Liquids: Gauging an Anyonic Symmetry
• Symmetry Enrichment in Three-Dimensional Topological Phases
• On the Brauer groups of symmetries of abelian Dijkgraaf-Witten theories
• Gauging (3+1)-dimensional topological phases: an approach from surface theories
• From orbifolding conformal field theories to gauging topological phases
• Twofold twist defect chains at criticality
• Theory of Hofstadter Superconductors