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Topological phononics arising from fluid-solid interactions.

Xiaoxiao Wu1,2, Haiyan Fan3, Tuo Liu4

  • 1Faculties of Sciences and Engineering, The University of Hong Kong, Hong Kong, China.

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This summary is machine-generated.

Researchers explored topological phononics by combining fluid and solid acoustics. They realized type-II nodal rings and drumhead surface states in a 3D phononic crystal, paving the way for advanced acoustic devices.

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Area of Science:

  • Topological physics
  • Classical acoustics
  • Condensed matter physics

Background:

  • Nontrivial band topologies are known in classical systems with device potential.
  • Sound exhibits different dynamics in fluids (scalar) and solids (vector).
  • Previous topological phononics research overlooked interactions between fluids and solids.

Purpose of the Study:

  • To develop a novel approach for topological phononics using coupled fluid-solid interactions.
  • To experimentally realize type-II nodal rings, which are elusive in phononics.
  • To demonstrate hallmark phenomena like tilted drumhead surface states.

Main Methods:

  • Design and fabrication of a three-dimensional phononic crystal.
  • Utilizing the interplay between fluid and solid acoustic dynamics.
  • Ultrasonic near-field scanning for experimental observation.

Main Results:

  • Successful realization of type-II nodal rings in the phononic crystal.
  • Direct observation of strongly tilted drumhead surface states.
  • Demonstration of a new platform for topological phononics.

Conclusions:

  • This work introduces a facile method for exploring topological physics in classical systems.
  • The developed phononic approach enables the design of high-performance acoustic devices.
  • Highlights the potential of hybrid fluid-solid systems for topological phenomena.