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Generation and Coherent Control of Pulsed Quantum Frequency Combs

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Published on: June 8, 2018

Parity-Frequency-Space Elastic Spin Control of Wave Routing in Topological Phononic Circuits.

Yao Huang¹, Chenwen Yang², Weitao Yuan³

¹School of Aerospace Engineering and Applied Mechanics, Tongji University, 100 Zhangwu Road, Shanghai, 200092, P. R. China.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)

|July 31, 2024

Summary

This study clarifies the chiral mechanism in topological phononic cavities, revealing how elastic spin texture dictates wave routing. Experiments demonstrate frequency-selective wave manipulation in topological whispering gallery modes (TWGMs) for robust phononic circuits.

Keywords:

elastic spin phononic circuits topological cavities wave routing

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Area of Science:

Condensed Matter Physics
Acoustics
Materials Science

Background:

Topological phononic cavities, utilizing topological whispering gallery modes (TWGMs), offer robust phononic circuit platforms.
The chiral mechanism and selective routing of TWGMs in integrated phononic circuits are not fully understood.

Purpose of the Study:

To elucidate the link between elastic spin texture and phonon eigenmodes at topological interfaces.
To demonstrate frequency-selective wave routing mechanisms in topological phononic cavities.

Main Methods:

Theoretical analysis of phonon eigenmodes and elastic spin texture.
Experimental realization of kHz TWGMs in honeycomb-lattice aluminum plates.
Investigation of coupled waveguide-resonator systems.

Main Results:

Elastic spin texture at topological interfaces is directly related to phonon eigenmodes within unit cells.
Paired, counterpropagating TWGMs exhibit frequency-locking of elastic spin.
Demonstrated triplicate parity-frequency-space selective wave routing mechanisms.

Conclusions:

The study provides a comprehensive understanding of the chiral mechanism in topological phononic cavities.
Identified spin-texture related angular-momentum locking and frequency-space selective routing mechanisms.
These findings pave the way for advanced elastic-spin based routing in phononic topological insulators.