Journal
APPLIED PHYSICS LETTERS
Volume 114, Issue 2, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.5049856
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Funding
- National Basic Research Program of China [2015CB755500]
- National Natural Science Foundation of China [11674250, 11774275, 11534013, 11747310]
- National Key R&D Program of China [2018FYA0305800]
- Natural Science Foundation of Hubei Province [2017CFA042]
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Here, we report an experimental study on the valley-projected edge states for underwater sound, which propagates along the interface separating two topologically distinct acoustic valley Hall insulators. The topological edge states are directly observed in our ultrasound scanning experiments, together with a solid evidence for the valley-selective excitation. Furthermore, we demonstrate an intriguing sound splitter built by topologically different acoustic valley Hall insulators. All experimental data agree well with our numerical results. Prospective applications can be anticipated, such as for underwater sound signal processing and ocean noise control.
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