@article{3bd16fe194e74abeb63f45c4fbf90723,
title = "Experimental characterization of fragile topology in an acoustic metamaterial",
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.",
author = "Valerio Peri and Song, {Zhi Da} and Marc Serra-Garcia and Pascal Engeler and Raquel Queiroz and Xueqin Huang and Weiyin Deng and Zhengyou Liu and {Andrei Bernevig}, B. and Huber, {Sebastian D.}",
note = "Funding Information: S.D.H., V.P., M.S.-G., and P.E. acknowledge support from the Swiss National Science Foundation, the Swiss National Center of Competence in Research QSIT, and the European Research Council under grant agreement 771503 (TopMechMat). Z.-D.S. and B.A.B. are supported by the Department of Energy grant DE-SC0016239, the National Science Foundation (NSF) EAGER grant DMR1643312, Simons Investigator Grant 404513, Office of Naval Research N00014-14-1-0330, NSF-Materials Research Science and Engineering Center DMR-142051, the Packard Foundation, and the Schmidt Fund for Innovative Research. B.A.B. is also supported by a Guggenheim Fellowship from the John Simon Guggenheim Memorial Foundation. Publisher Copyright: {\textcopyright} 2020 American Association for the Advancement of Science. All rights reserved.",
year = "2020",
month = feb,
day = "14",
doi = "10.1126/science.aaz7654",
language = "English (US)",
volume = "367",
pages = "797--800",
journal = "Science",
issn = "0036-8075",
publisher = "American Association for the Advancement of Science",
number = "6479",
}