Journal
PHYSICAL REVIEW LETTERS
Volume 126, Issue 15, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.126.156801
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Funding
- National Natural Science Foundation of China [11890701, 11804101, 11704128, 11774275, 11974120, 11974005, 12074128]
- National Key R&D Program of China [2018YFA0305800]
- Guangdong Basic and Applied Basic Research Foundation [2019B151502012, 2021B1515020086]
- Guangdong Innovative and Entrepreneurial Research Team Program [2016ZT06C594]
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The study introduces a new type of topological insulator in a bilayer phononic crystal, which combines first-order and second-order topological features, with one-dimensional edge states and zero-dimensional corner states existing simultaneously in the same system.
Topological phases, including the conventional first-order and higher-order topological insulators and semimetals, have emerged as a thriving topic in the fields of condensed-matter physics and materials science. Usually, a topological insulator is characterized by a fixed order topological invariant and exhibits associated bulk-boundary correspondence. Here, we realize a new type of topological insulator in a bilayer phononic crystal, which hosts simultaneously the first-order and second-order topologies, referred to here as the hybrid-order topological insulator. The one-dimensional gapless helical edge states, and zero-dimensional corner states coexist in the same system. The new hybrid-order topological phase may produce novel applications in topological acoustic devices.
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