SciPost Submission Page
Phase transitions in quantum dot-Majorana zero mode coupling systems
by Yue Mao, Qing-Feng Sun
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: |
- Condensed Matter Physics - Theory
|
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
We thank the editor for taking care of our paper and considering it for the review process. We thank the referee for reading our manuscript and providing critical comments. We have provided the reply to comments raised by the referee as individual author reply.
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].
