| Title: |
Hybrid-order topology of weak topological insulators |
| Authors: |
Kooi, Sander H.; Van Miert, Guido; Ortix, Carmine; Sub Cond-Matter Theory, Stat & Comp Phys; Theoretical Physics |
| Publication Year: |
2020 |
| Subject Terms: |
Electronic; Optical and Magnetic Materials; Condensed Matter Physics |
| Description: |
We consider weak topological insulators with a twofold rotation symmetry around their "dark"direction and show that these systems can be endowed with the topological crystalline structure of a higher-order topological insulator protected by rotation symmetry. These hybrid-order weak topological insulators display surface Dirac cones on all surfaces. Translational symmetry breaking perturbations gap the Dirac cones on the side surfaces leaving anomalous helical hinge modes behind. We also prove that the existence of this topological phase comes about due to a novel crystalline topological invariant of quantum spin-Hall insulators that can neither be revealed by symmetry indicators nor using Wilson loop invariants. Considering the minimal symmetry requirements, we anticipate that our findings could apply to a large number of weak topological insulators. |
| Document Type: |
article in journal/newspaper |
| File Description: |
text/plain |
| Language: |
English |
| ISSN: |
2469-9950 |
| Relation: |
https://dspace.library.uu.nl/handle/1874/409457 |
| Availability: |
https://dspace.library.uu.nl/handle/1874/409457 |
| Rights: |
info:eu-repo/semantics/OpenAccess |
| Accession Number: |
edsbas.A05BEAD2 |
| Database: |
BASE |