Topological phononics arising from fluid-solid interactions

Xiaoxiao Wu, Haiyan Fan, Tuo Liu, Zhongming Gu, Ruo-Yang Zhang, Jie Zhu () and Xiang Zhang ()
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Xiaoxiao Wu: The University of Hong Kong
Haiyan Fan: The Hong Kong Polytechnic University, Hung Hom, Kowloon
Tuo Liu: Chinese Academy of Sciences
Zhongming Gu: Tongji University
Ruo-Yang Zhang: The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon
Jie Zhu: Tongji University
Xiang Zhang: The University of Hong Kong

Nature Communications, 2022, vol. 13, issue 1, 1-7

Abstract: Abstract Nontrivial band topologies have been discovered in classical systems and hold great potential for device applications. Unlike photons, sound has fundamentally different dynamics and symmetries in fluids and solids, represented as scalar and vector fields, respectively. So far, searches for topological phononic materials have only concerned sound in either fluids or solids alone, overlooking their intricate interactions in “mixtures”. Here, we report an approach for topological phononics employing such unique interplay, and demonstrate the realization of type-II nodal rings, elusive in phononics, in a simple three-dimensional phononic crystal. Type-II nodal rings, as line degeneracies in momentum space with exotic properties from strong tilting, are directly observed through ultrasonic near-field scanning. Strongly tilted drumhead surface states, the hallmark phenomena, are also experimentally demonstrated. This phononic approach opens a door to explore topological physics in classical systems, which is easy to implement that can be used for designing high-performance acoustic devices.

Date: 2022
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DOI: 10.1038/s41467-022-33896-4

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