Demonstration of a quantized acoustic octupole topological insulator

Xiang Ni, Mengyao Li, Matthew Weiner, Andrea Alù () and Alexander B. Khanikaev ()
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Xiang Ni: City College of the City University of New York
Mengyao Li: City College of the City University of New York
Matthew Weiner: City College of the City University of New York
Andrea Alù: City College of the City University of New York
Alexander B. Khanikaev: City College of the City University of New York

Nature Communications, 2020, vol. 11, issue 1, 1-7

Abstract: Abstract Recently introduced quantized multipole topological insulators (QMTIs) reveal new types of gapped boundary states, which themselves represent lower-dimensional topological phases and host symmetry protected zero-dimensional corner states. Inspired by these predictions, tremendous efforts have been devoted to the experimental observation of quantized quadrupole topological phase. However, due to stringent requirements of anti-commuting reflection symmetries, it is challenging to achieve higher-order quantized multipole moments, such as octupole moments, in a three-dimensional structure. Here, we overcome this challenge, and experimentally realize the acoustic analogue of a quantized octupole topological insulator using negatively coupled resonators. We confirm by first-principle studies that our design possesses a quantized octupole topological phase, and experimentally demonstrate spectroscopic evidence of a hierarchy of boundary modes, observing 3rd order topological corner states. Furthermore, we reveal topological phase transitions from higher- to lower-order multipole moments. Our work offers a pathway to explore higher-order topological states in 3D classical platforms.

Date: 2020
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DOI: 10.1038/s41467-020-15705-y

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