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Phase transitions in quantum dot-Majorana zero mode coupling systems
by Yue Mao, Qing-Feng Sun
This is not the latest submitted version.
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Submission summary
| Authors (as registered SciPost users): | Yue Mao |
| Submission information | |
|---|---|
| Preprint Link: | scipost_202406_00024v2 (pdf) |
| Date submitted: | 2024-10-06 09:31 |
| Submitted by: | Mao, Yue |
| Submitted to: | SciPost Physics Core |
| Ontological classification | |
|---|---|
| Academic field: | Physics |
| Specialties: |
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Abstract
The magnetic doublet ground state (GS) of quantum dot (QD) could be changed to a spin-singlet GS by coupling to a superconductor. In analogy, here we study the GS phase transitions in QD-Majorana zero mode (MZM) coupling systems: GS behaves phase transition versus intra-dot energy level and QD-MZM coupling strength. The phase diagrams of GS are obtained, for cases with and without Zeeman term. Along with the phase transition, we also study the change of spin feature and density of states. The properties of phase transition are understood via a mean-field picture. Our study not only serves as an analogue of QD-superconductor phase transitions, but also gives alternative explanations on MZM-relevant experiments.
Author comments upon resubmission
List of changes
- At the end of abstract, we add a sentence to emphasize the importance of our study.
- In lines 71-74, we add discussions on previous studies about lead-QD-MZM systems.
- In lines 75-78, we additionally explain why the superconductor is not included.
- In lines 84-93, we additionally explain MZM-QD coupling.
- In lines 100-102, 105, we add discussions on previous studies about Kondo effect.
- In lines 299-311, 353-354, we add some contents to emphasize our study's relevance to experiments.
- In lines 370-385, we add an Appendix to clarify the role of normal lead. This is also additionally mentioned in lines 59, 98-99.
- We also add a figure [Fig. 7] to help clarifying the role of normal lead.
- We add a reference [Ref. 55].
Current status:
Reports on this Submission
Report #1 by Anonymous (Referee 1) on 2025-1-21 (Invited Report)
- Cite as: Anonymous, Report on arXiv:scipost_202406_00024v2, delivered 2025-01-21, doi: 10.21468/SciPost.Report.10527
Strengths
- provides analytical expressions
- clear explanation of what is done and what effects are neglected
Weaknesses
- potentially important effects are neglected, but the paper is now transparent about this
Report
The authors have answered my questions, and extended their discussions considerably. I still believe that the paper neglects what are relevant effects in real experiments. However, they authors are now also very transparent about this aspect.
Hence, I believe the acceptance criteria for Scipost Physics Core are fulfilled, given that the analytical results of the authors can be interesting to some practitioners in the field.
However, the paper has several language errors, and I would recommend to have it properly proofread.
Recommendation
Ask for minor revision
Author: Yue Mao on 2025-02-03 [id 5180]
(in reply to Report 1 on 2025-01-21)We thank the referee for the feedback and suggestions. We have carefully checked the language of our manuscript, and made modifications accordingly.