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Experimental characterization of fragile topology in an acoustic metamaterial
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Experimental characterization of fragile topology in an acoustic metamaterial
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Journal Article
Experimental characterization of fragile topology in an acoustic metamaterial
2020
Overview
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.
Publisher
American Association for the Advancement of Science,The American Association for the Advancement of Science,AAAS
