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Ground state topology of a four-terminal superconducting double quantum dot

by Lev Teshler, Hannes Weisbrich, Jonathan Sturm, Raffael L. Klees, Gianluca Rastelli, Wolfgang Belzig

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Submission summary

Authors (as registered SciPost users): Wolfgang Belzig
Submission information
Preprint Link:  (pdf)
Date accepted: 2023-11-10
Date submitted: 2023-09-04 10:05
Submitted by: Belzig, Wolfgang
Submitted to: SciPost Physics
Ontological classification
Academic field: Physics
  • Condensed Matter Physics - Theory
  • Quantum Physics
Approach: Theoretical


In recent years, various classes of systems were proposed to realize topological states of matter. One of them are multiterminal Josephson junctions where topological Andreev bound states are constructed in the synthetic space of superconducting phases. Crucially, the topology in these systems results in a quantized transconductance between two of its terminals comparable to the quantum Hall effect. In this work, we study a double quantum dot with four superconducting terminals and show that it has an experimentally accessible topological regime in which the non-trivial topology can be measured. We also include Coulomb repulsion between electrons which is usually present in experiments and show how the topological region can be maximized in parameter space.

Author comments upon resubmission

Dear Editor,

hereby we resubmit our article to scipost. We have addressed all comments by the reviewers. Thank you and the reviewer for the time to evaluate the article. Since the referees were overall positive and in favour of publication we hope the article can be accepted for SciPost Physics.

Kind regards,
Wolfgang Belzig (on behalf of all authors)

List of changes

The list of changes is given in the replies to the referees.

Published as SciPost Phys. 15, 214 (2023)

Reports on this Submission

Anonymous Report 2 on 2023-10-21 (Invited Report)


In my opinion the authors answered satisfactorily to all remarks from the reviewers. Their results are original. They provide the possibility to discuss the effect of interactions on the topological properties of superconducting multiterminal systems made with quantum dots. I believe the article can be inspirational for future theoretical and experimental work in the field. Therefore, I recommend its publication in Sci Post Physics.

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Anonymous Report 1 on 2023-9-11 (Invited Report)


After reviewing the requested changes by both of the previous reports and comparing with the updated version of the manuscript, I believe all the noted technical issues have been addressed.

As far as criteria/expectations for publishing, this work easily meets the criteria of SciPost Physics Core. The work provides a clear and simple model of some physics that is well-developed by their group and others, so I am less certain about publishing in SciPost Physics, where a high degree of innovation is typically required.

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