arXiv:1806.09418 [cond-mat.mes-hall]AbstractReferencesReviewsResources Classifications Subjects Themes Keywords acoustic higher-order topological insulator, kagome lattice, topological bulk-boundary correspondence principle, exhibiting quantized quadrupole polarization, metamaterials exhibiting quantized quadrupole Tags Journal Information Publisher Journal Year Month Volume Number Pages DOI URL Miscellaneous Typesetting Pages Language License Submit Reset