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Charge order from structured coupling in VSe$_2$
by Jans Henke, Felix Flicker, Jude Laverock, Jasper van Wezel
This Submission thread is now published as
Submission summary
| Authors (as registered SciPost users): | Jans Henke · Jasper van Wezel |
| Submission information | |
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| Preprint Link: | https://arxiv.org/abs/1911.11112v3 (pdf) |
| Date accepted: | 2020-10-13 |
| Date submitted: | 2020-09-22 12:23 |
| Submitted by: | Henke, Jans |
| Submitted to: | SciPost Physics |
| Ontological classification | |
|---|---|
| Academic field: | Physics |
| Specialties: |
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| Approaches: | Theoretical, Computational |
Abstract
Charge order -- ubiquitous among correlated materials -- is customarily described purely as an instability of the electronic structure. However, the resulting theoretical predictions often do not match high-resolution experimental data. A pertinent case is $1T$-VSe$_2$, whose single-band Fermi surface and weak-coupling nature make it qualitatively similar to the Peierls model underlying the traditional approach. Despite this, its Fermi surface is poorly nested, the thermal evolution of its charge density wave (CDW) ordering vectors displays an unexpected jump, and the CDW gap itself evades detection in direct probes of the electronic structure. We demonstrate that the thermal variation of the CDW vectors is naturally reproduced by the electronic susceptibility when incorporating a structured, momentum-dependent electron-phonon coupling, while the evasive CDW gap presents itself as a localized suppression of spectral weight centered above the Fermi level. Our results showcase the general utility of incorporating a structured coupling in the description of charge ordered materials, including those that appear unconventional.
Author comments upon resubmission
List of changes
- Removed "d-orbital" from the caption of Figure 1.
- Added the sentence "All plots employ the same colour scale." to the captions of Figures 4 & 8.
- Fixed a typo in Figure caption 4: the spectral broadening is 15i meV rather than 10i meV.
Published as SciPost Phys. 9, 056 (2020)
Reports on this Submission
Report #1 by Anonymous (Referee 1) on 2020-10-6 (Invited Report)
- Cite as: Anonymous, Report on arXiv:1911.11112v3, delivered 2020-10-06, doi: 10.21468/SciPost.Report.2051
Report
In their response the authors addressed my comments and slightly modified the manuscript accordingly. The detailed answer to the technical question Q2 allows a better understanding and justification of the relevance of the presented results. This confirms the importance of this work for a better understanding of experiments (in particular ARPES measurements).
In line with my previous report I therefore recommend this manuscript for publication in SciPost Physics.