SciPost Submission Page
Spin-polarized two-dimensional electron/hole gases on LiCoO$_2$ layers.
by Santosh Kumar Radha and Walter R. L. Lambrecht
This Submission thread is now published as
Submission summary
| Authors (as registered SciPost users): | Santosh Kumar Radha |
| Submission information | |
|---|---|
| Preprint Link: | scipost_202011_00010v2 (pdf) |
| Date accepted: | 2021-02-19 |
| Date submitted: | 2020-12-25 16:21 |
| Submitted by: | Radha, Santosh Kumar |
| Submitted to: | SciPost Physics |
| Ontological classification | |
|---|---|
| Academic field: | Physics |
| Specialties: |
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| Approaches: | Theoretical, Computational |
Abstract
First-principles calculations show the formation of a 2D spin polarized electron (hole) gas on the Li (CoO$_2$) terminated surfaces of finite slabs down to a monolayer, in remarkable contrast with the bulk band structure, which is stabilized by Li donating its electron to the CoO$_2$ layer forming a Co-$d-t_{2g}^6$ insulator. By mapping the first-principles computational results to a minimal tight-binding models corresponding to a non-chiral 3D generalization of the quadripartite Su-Schrieffer-Heeger (SSH4) model and symmetry analysis, we show that these surface states have topological origin.
Author comments upon resubmission
We have added the requested changes and replies.
Best,
Santosh
List of changes
Page 1
1) added explecitly the statement that the surface states are not topologically protected
2) reference to Zak's and Maue-Shockley's paper
3) band structure reference
Page 2
1) removed illustration from the figure 1
2)changed interaction to hopping parameters
Page 3
1) changed interaction to hopping parameters
page 4
1)added values of hopping parameters
2) again explained the absence of topological protection of the surface states
page 5
1) added a new section referencing and detailing experemental evidence
page 6/7
1) added more details and discussion on connection to topological states.
other pages
1) changed interaction to hopping parameters
Published as SciPost Phys. 10, 057 (2021)
Reports on this Submission
Report
The authors have addressed my comments. In particular, they have clarified that the surface states they find are not topological per se; they are instead related to the topological surface state of a "parent" chiral symmetric model.
I recommend publication of the revised version of the manuscript in SciPost Physics.
Report
The authors have fully addressed all the points I raised during the first round of review. My recommendation is to publish this paper in SciPost Physics as is. As an aside, I want to say that I appreciate very much the fact that they have also published their code and numerical data.