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Interaction and collision of skyrmions in chiral antiferromagnets
by George Theodorou, Stavros Komineas
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Submission summary
| Authors (as registered SciPost users): | Stavros Komineas |
| Submission information | |
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| Preprint Link: | https://arxiv.org/abs/2305.13515v1 (pdf) |
| Date submitted: | May 24, 2023, 7:13 a.m. |
| Submitted by: | Komineas, Stavros |
| Submitted to: | SciPost Physics |
| Ontological classification | |
|---|---|
| Academic field: | Physics |
| Specialties: |
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| Approaches: | Theoretical, Computational |
Abstract
Skyrmions in an antiferromagnet can travel as solitary waves in stark contrast to the situation in ferromagnets. Traveling skyrmion solutions have been found numerically in chiral antiferromagnets. We consider head-on collision events between two skyrmions. We find that the result of the collision depends on the initial velocity of the skyrmions. For small velocities, the skyrmions are shrinking as they are approaching, they bounce back and eventually acquire almost their initial speed. For larger velocities, the skyrmions approach each other and shrink until they become singular points and are eventually annihilated. We describe the observed phenomena in terms of skyrmion energetics and thus determine the regimes of the different dynamical behaviors.
Current status:
Reports on this Submission
Report #2 by Elizaveta Tremsina (Referee 2) on 2024-5-23 (Invited Report)
- Cite as: Elizaveta Tremsina, Report on arXiv:2305.13515v1, delivered 2024-05-23, doi: 10.21468/SciPost.Report.9124
Strengths
- Work is well presented
- Model and method clearly presented
- Interesting collision cases presented
Weaknesses
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Missing key references to past work in introduction, especially regarding chiral skyrmion dynamics. 10.1103/PhysRevLett.116.147203 10.1103/PhysRevB.106.L220402 10.1126/SCIENCE.ADD5751
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No mention of skyrmion mass or inertia, perhaps this is relevant point to consider when talking about energetics of collisions. 10.1103/PhysRevB.106.144405
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The effective field approach provided in section 3 seems like a nice simple model but it is unclear how it is actually used in the simulations to make sense of the collisions or predict their various outcomes. Thus, it is difficult to objectively judge the validity and usefulness of that portion of the work.
Additionally, perhaps it would be useful to tie in past work on skyrmion-skyrmion interactions, in which the potential function was derived analytically, and see how it relates to the field analytics of section 3. 10.1038/s42005-023-01145-9
Report
Requested changes
- Add references to past work
- Explain the exact choice of material parameters used
- Address the weakness points listed above
Recommendation
Ask for major revision
Report #1 by Anonymous (Referee 1) on 2024-4-29 (Invited Report)
- Cite as: Anonymous, Report on arXiv:2305.13515v1, delivered 2024-04-29, doi: 10.21468/SciPost.Report.8951
Strengths
1-clearly written and structured 2-numerical discovery of new type of skyrmion scattering with associated scale change in antiferromagnetic materials 3- clear discussion of the results, with good set of references
Weaknesses
Report
Requested changes
Towards the end of the paper the authors begin a discussion of how one might understand the interaction behaviour they observe numerically. This discussion is merely a sketch at the moment: it contains unjustified assumptions (`Assuming that f_2 is larger ...'). The authors should justify this assumption and pursue the analytical study to produce an understanding of the interaction behaviour.
Recommendation
Ask for major revision