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Journal Article

Experimental characterization of fragile topology in an acoustic metamaterial


Bernevig,  B. Andrei
Max Planck Institute of Microstructure Physics, Max Planck Society;

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Peri, V., Song, Z.-D., Serra-Garcia, M., Engeler, P., Queiroz, R., Huang, X., et al. (2020). Experimental characterization of fragile topology in an acoustic metamaterial. Science, 367(6479), 797-800. doi:10.1126/science.aaz7654.

Cite as: https://hdl.handle.net/21.11116/0000-0008-8923-6
Symmetries crucially underlie the classification of topological phases of matter. Most materials, both natural as well as architectured, possess crystalline symmetries. Recent theoretical works unveiled that these crystalline symmetries can stabilize fragile Bloch bands that challenge our very notion of topology: Although answering to the most basic definition of topology, one can trivialize these bands through the addition of trivial Bloch bands. Here, we fully characterize the symmetry properties of the response of an acoustic metamaterial to establish the fragile nature of the low-lying Bloch bands. Additionally, we present a spectral signature in the form of spectral flow under twisted boundary conditions.