Abstract
Localized topological midgap states are important for their robustness against disorder, but their natural localization limits their application. In this Letter the authors use an acoustic system to experimentally verify the existence of bulk states that belong to the band and, despite being extended, are robust against Hermitian and non-Hermitian disorders. The robustness of these bulk states cannot be expressed using the usual bulk-boundary correspondence. These results lift the limitation on localized topological states and can be used to develop robust acoustic devices based on far-field waves, including far-field imaging.
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