Analogous Black Holes in Type-III Dirac Semimetal Ni3In2X2 (X = S, Se)
Round 1
Reviewer 1 Report
In this paper, the author investigates the topological properties of Ni3In2X2 (X = S, Se), whose electronic spectrum has features that allow one to study effects in black holes by analogy. In general, the topic of the work is interesting, however, it seems to me that the text of the manuscript and the presentation of the material need to be improved.
Since this is a fairly new topic, it might be worthwhile to explain more clearly and in details how exactly the analogy with effects in black holes is realized, why the type-III Dirac spectrum is important for this, paying more attention to the physical side of the effects.
The analysis of topological properties is unclear (lines 113-117).
I was unable to download the supplementary to the manuscript.
Editing of the text is required, since in many places the sentences do not begin with a capital letter or are broken in arbitrary places (please, pay attention to lines 28, 37, 70-72, 132; captions for Fig. 2)
Minor editing of English language required
Author Response
see attached
Author Response File: 
Author Response.pdf
Reviewer 2 Report
In this manuscript the authors performed first-principles calculations for Ni3In2X2 (X = S, Se) compounds to present to type-III Dirac cones. The author claim that type-III Dirac cones lead to the emergence of an event horizon and the formation of a black hole-like region near the Dirac point. Interestingly, the topological number analysis shows that there are some prominent regions with strong topological charges. Overall, this work is novel and interesting, hence I would like to recommend it for publication in Crystals before the author can properly address following comments.
1. This Dirac point in momentum space should be marked inside the Brillouin zone for observation.
2. The schematic diagram of the Dirac cones are shown in Figure 1, but what are the 3D dispersion of Dirac points in the actual materials Ni3In2X2 (X = S, Se).
3. Dirac Semimetal have already been reported in several papers e.g., see J. Phys. Chem. Lett. 2017, 8, 19, 4814–4819, Phys. Rev. B 95, 235116, Phys. Rev. B 88, 125427, Phys. Rev. B 85, 195320, and so on. What is the difference with these Dirac semimetals, the authors should add a discussion.
4. Writing errors in the manuscript such as “The bulk band structure [Fig. ??] was calculated from the ’SCF’ calculation by utilizing the ’BANDS’ flag in Quantum Espresso.’’ The author should carefully check the manuscript.
The English is OK
Author Response
see attached
Author Response File: Author Response.pdf
Round 2
Reviewer 1 Report
Authors addressed my questions, so I think that the manuscript can be published after correcting typos.
Several typos should be corrected.
