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Frequency Band-Controllable Acoustic Topological Insulators Based on Local Dimensional Coordination.

Xiao Liang1,2, Jiangxia Luo1, Jiaming Chu1

  • 1Xiangtan University School of Mechanical Engineering and Mechanics, Xiangtan 411105, China.

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Summary
This summary is machine-generated.

This study introduces a novel acoustic topological insulator that precisely controls unidirectional wave transmission frequency. This advancement offers new possibilities for topology-protected edge states in specific frequency bands.

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Area of Science:

  • Acoustic Metamaterials
  • Condensed Matter Physics
  • Wave Phenomena

Background:

  • Acoustic topological insulators exhibit unique unidirectional transmission due to topology-protected edge states.
  • Controlling the frequency range of this unidirectional transmission is crucial for practical applications.

Purpose of the Study:

  • To design and demonstrate a frequency band-controlled acoustic topological insulator.
  • To enable precise control over the unidirectional transmission frequency range by manipulating the band gap position.

Main Methods:

  • Utilized local dimensional coordination to design the acoustic topological insulator.
  • Employed the finite element method to analyze energy band structure and eigenmodes.
  • Derived the relationship between local dimension length and band gap position.

Main Results:

  • Successfully demonstrated control over the band gap position by adjusting the local dimension length.
  • Experimentally verified the control of the band gap's influence on unidirectional propagation frequency.
  • Established a method for precisely tuning the frequency range of topology-protected edge states.

Conclusions:

  • The designed acoustic topological insulator allows for tunable unidirectional transmission frequency.
  • This precise control over topology-protected edge states opens new avenues for acoustic device applications.
  • The findings provide a pathway for engineering specific frequency bands for acoustic wave manipulation.