Line defects in three-dimensional symmetry-protected topological phases

Zhen Bi, Alex Rasmussen, Cenke Xu

Research output: Contribution to journalArticlepeer-review

14 Scopus citations


A three-dimensional (3D) symmetry-protected topological (SPT) phase by definition must have symmetry-protected nontrivial boundary states; namely, its two-dimensional (2D) boundary must be either gapless or degenerate. In this work we demonstrate that once we couple a 3D SPT phase to a lattice dynamical Z2 gauge field, in many cases the Z2 vison line excitation (line defect) can be viewed as a â€one-dimensional (1D) boundary†of the 3D SPT phase, and this line defect is guaranteed to have a gapless or degenerate spectrum, which is also protected by the symmetry of the SPT phase.

Original languageEnglish (US)
Article number184424
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number18
StatePublished - May 29 2014

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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