Twisted bulk-boundary correspondence of fragile topology
Abstract
Exploiting topological features in materials is being pursued as a route to build in robustness of particular properties. Stemming from crystalline symmetries, such topological protection renders the properties robust against defects and provides a platform of rich physics to be studied. Recent developments have revealed the existence of so-called fragile topological phases, where the means of classification due to symmetry is unclear. Z.-D. Song et al. and Peri et al. present a combined theoretical and experimental approach to identify, classify, and measure the properties of fragile topological phases. By invoking twisted boundary conditions, they are able to describe the properties of fragile topological states and verify the expected experimental signature in an acoustic crystal. Understanding how fragile topology arises could be used to develop new materials with exotic properties.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Feb 14, 2020
- Source ID
- 10.1126/science.aaz7650
Entities
People
- Andrei Bernevig
- Luis Elcoro
- Zhi-Da Song
Organizations
- David and Lucile Packard Foundation
- Freie Universität Berlin
- Max Planck Institute for Microstructure Physics
- National Science Foundation
- Office of Naval Research
- Princeton University
- United States Department of Energy
- University of the Basque Country