Subwavelength Chiral Spiral Acoustic Metamaterials for a Robust Topological Acoustic Insulator
Round 1
Reviewer 1 Report
Dear Authors
Thank you for your interesting work.
Author Response
We are truly grateful for your positive appraisal and affirmation for our work.
Reviewer 2 Report
In the paper entitled “Topological transportation in subwavelength chiral spiral acoustic metamaterials”, the chiral spiral acoustic metamaterials are constructed based on the Archimedean spiral structure. This structure enjoys subwavelength characteristics and is easy to construct. The topological acoustic insulator with a chiral spiral structure provides a novel strategy for small acoustic devices with robust sound transmission.
COMMENTS
The title of the article could be improved to better describe the subject of research, e.g.:
“Subwavelength chiral spiral acoustic metamaterials for a robust topological acoustic insulator”
Figure 4 is blurred.
Author Response
Thanks for your positive comments. We give the point-by-point response, please see the attachment.
Author Response File: 
Author Response.pdf
Reviewer 3 Report
This paper proposed a topological acoustic insulator with a chiral spiral structure that provides a novel strategy for small acoustic devices with the capability of sound manipulation. The impacts of different parameters of the spiral were investigated and the results were appropriately interpreted. I have a few questions regarding this work:
1. There have been similar works on spiral acoustic metamaterials. Can the authors highlight the most important findings and the major novelty of this study? What's the new knowledge of this study added to our understanding of this field?
2. Did the authors calculate the evolution of valley Chern number for different chiralities? Chern number is useful for revealing the characteristics of the metamaterials, such as the topological transition of the spiral metamaterial.
Author Response
Thanks for your positive comments. We give the point-by-point response, please see the attachment.
Author Response File: Author Response.pdf
