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Article summary:
1. The concept of a higher-order topological insulator has prompted increasing scientific interest in achieving lower-dimensional boundary states.
2. Subwavelength acoustic waveguide networks are used to construct sonic lattices and modulate the coupling strength in both 2D and 3D systems.
3. Topological corner modes of second-/third-order topological insulators appear when the intra-cell coupling strength is weaker than the inter-cell one, with potential applications in sound confinement and energy harvesting.
Article analysis:
The article “Subwavelength higher-order topological insulator based on stereo acoustic networks” is an informative piece that provides insight into the potential applications of subwavelength acoustic waveguide networks for constructing sonic lattices and modulating the coupling strength in both 2D and 3D systems. The article is well written, with clear explanations of the concepts discussed, as well as detailed descriptions of the experiments conducted to test their theories. However, there are some areas where more information could be provided to make it more comprehensive. For example, while the article mentions potential applications for sound confinement and energy harvesting, it does not provide any evidence or data to support these claims. Additionally, while the authors acknowledge that their research was supported by various grants from government organizations, they do not provide any details about how this funding was used or what impact it had on their research outcomes. Furthermore, while they mention possible risks associated with their research, they do not provide any further information about these risks or how they can be mitigated. Finally, while they discuss potential counterarguments to their theories, they do not explore them in depth or present both sides equally. In conclusion, this article provides a good overview of its topic but could benefit from providing more evidence and exploring counterarguments in greater detail.