Bulk-boundary-defect correspondence at disclinations in rotation-symmetric topological insulators and superconductors

Abstract

We study a link between the ground-state topology and the topology of the lattice via the presence of anomalous states at disclinations -- topological lattice defects that violate a rotation symmetry only locally. We first show the existence of anomalous disclination states, such as Majorana zero-modes or helical electronic states, in second-order topological phases by means of Volterra processes. Using the framework of topological crystals to construct $d$-dimensional crystalline topological phases with rotation and translation symmetry, we then identify all contributions to $(d-2)$-dimensional anomalous disclination states from weak and first-order topological phases. We perform this procedure for all Cartan symmetry classes of topological insulators and superconductors in two and three dimensions and determine whether the correspondence between bulk topology, boundary signatures, and disclination anomaly is unique.

arXiv commentv3: 45 + 26 pages, 16 + 7 figures, minor revision for clarifications and improved readability. v2: 38 + 25 pages, 15 + 7 figures, format for scipost submission, updated references. v1: 19 + 15 pages, 15 + 7 figures

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