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  Experimental characterization of fragile topology in an acoustic metamaterial

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.

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Item Permalink: https://hdl.handle.net/21.11116/0000-0008-8923-6 Version Permalink: https://hdl.handle.net/21.11116/0000-0009-4F33-6
Genre: Journal Article

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https://doi.org/10.1126/science.aaz7654 (Publisher version)
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 Creators:
Peri, Valerio1, Author
Song, Zhi-Da1, Author
Serra-Garcia, Marc1, Author
Engeler, Pascal1, Author
Queiroz, Raquel1, Author
Huang, Xueqin1, Author
Deng, Weiyin1, Author
Liu, Zhenyou1, Author
Bernevig, B. Andrei2, Author
Huber, Sebastian1, Author
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1External Organizations, ou_persistent22              
2Max Planck Institute of Microstructure Physics, Max Planck Society, Weinberg 2, 06120 Halle, DE, ou_2415691              

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 Abstract: 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.

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 Dates: 2020-02-14
 Publication Status: Issued
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 Identifiers: BibTex Citekey: P13874
DOI: 10.1126/science.aaz7654
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Title: Science
  Abbreviation : Science
Source Genre: Journal
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Publ. Info: Washington, D.C. : American Association for the Advancement of Science
Pages: - Volume / Issue: 367 (6479) Sequence Number: - Start / End Page: 797 - 800 Identifier: ISSN: 0036-8075
CoNE: https://pure.mpg.de/cone/journals/resource/991042748276600_1