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Observation of an acoustic topological Euler insulator with meronic waves.
- Source :
-
Science Bulletin . Jun2024, Vol. 69 Issue 11, p1653-1659. 7p. - Publication Year :
- 2024
-
Abstract
- Topological band theory has conventionally been concerned with the topology of bands around a single gap. Only recently non-Abelian topologies that thrive on involving multiple gaps were studied, unveiling a new horizon in topological physics beyond the conventional paradigm. Here, we report on the first experimental realization of a topological Euler insulator phase with unique meronic characterization in an acoustic metamaterial. We demonstrate that this topological phase has several nontrivial features: First, the system cannot be described by conventional topological band theory, but has a nontrivial Euler class that captures the unconventional geometry of the Bloch bands in the Brillouin zone. Second, we uncover in theory and probe in experiments a meronic configuration of the bulk Bloch states for the first time. Third, using a detailed symmetry analysis, we show that the topological Euler insulator evolves from a non-Abelian topological semimetal phase via. the annihilation of Dirac points in pairs in one of the band gaps. With these nontrivial properties, we establish concretely an unconventional bulk-edge correspondence which is confirmed by directly measuring the edge states via. pump-probe techniques. Our work thus unveils a nontrivial topological Euler insulator phase with a unique meronic pattern and paves the way as a platform for non-Abelian topological phenomena. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 20959273
- Volume :
- 69
- Issue :
- 11
- Database :
- Academic Search Index
- Journal :
- Science Bulletin
- Publication Type :
- Academic Journal
- Accession number :
- 177847147
- Full Text :
- https://doi.org/10.1016/j.scib.2024.04.009