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Transport signature of the magnetic Berezinskii-Kosterlitz-Thouless transition
by Se Kwon Kim, Suk Bum Chung
This Submission thread is now published as
Submission summary
| Authors (as registered SciPost users): | Suk Bum Chung |
| Submission information | |
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| Preprint Link: | scipost_202102_00030v1 (pdf) |
| Date accepted: | March 5, 2021 |
| Date submitted: | Feb. 22, 2021, 10:29 a.m. |
| Submitted by: | Chung, Suk Bum |
| Submitted to: | SciPost Physics |
| Ontological classification | |
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| Academic field: | Physics |
| Specialties: |
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| Approach: | Theoretical |
Abstract
Motivated by recent experimental progress in 2D magnetism, we theoretically study spin transport in 2D easy-plane magnets at finite temperatures across the Berezinskii-Kosterlitz-Thouless (BKT) phase transition, by developing a duality mapping to the 2+1D electromagnetism with the full account of spin's finite lifetime. In particular, we find that the non-conservation of spin gives rise to a distinct signature across the BKT transition, with the spin current decaying with distance power-law (exponentially) below (above) the transition; this is detectable in the proposed experiment with NiPS3 and CrCl3.
Author comments upon resubmission
We have made all the requested changes, as we are listing below.
List of changes
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We have added in Introduction the new references to the recent CrCl3 experiment and the thin film melting transition experiments.
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We have addressed the terminology issue in the sentence of Eq 4.
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We have added to the footnote of Eq 4a an explanation on how the Rayleigh dissipation term gives rise to the finite spin lifetime.
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In the caption to Fig 2, we have added a mention of temperature window where the free meron density follows the BKT formula, and we have revised Fig 2 itself so that all curves are plotted for temperature sufficiently close to T_BKT.
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We have added a footnote to the penultimate sentence of Conclusion to note a case where the in-plane anisotropy does not
qualitatively affect the BKT transition.
Published as SciPost Phys. 10, 068 (2021)