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Experimental characterization of fragile topology in an acoustic metamaterialPeri, Valerio; Song, Zhi-Da; Serra-Garcia, Marc; Engeler, Pascal; Queiroz, Raquel; Huang, Xueqin; Deng, Weiyin; Liu, Zhengyou; Bernevig, B. Andrei; Huber, Sebastian D. · Science · 2020