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

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.