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

Year: 2023

Authors: Teshler L., Weisbrich H., Sturm J., Klees RL., Rastelli G., Belzig W.

Autors Affiliation: Univ Konstanz, Fachbereich Phys, Univ Str 40, D-78457 Constance, Germany; Julius Maximilians Univ Wurzburg, Inst Theoret Phys & Astrophys, D-97074 Wurzburg, Germany; Univ Trento, Pitaevskii BEC Ctr, CNR, INO, I-38123 Trento, Italy; Univ Trento, Dipartimento Fis, I-38123 Trento, Italy.

Abstract: 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.

Journal/Review: SCIPOST PHYSICS

Volume: 15 (5)      Pages from: 214-1  to: 214-17

More Information: This work was financially supported by the Deutsche Forschungsgemeinschaft (DFG; German Research Foundation) project no. 467596333 and project no. 425217212 via the Collaborative Research Center SFB 1432.
KeyWords: Andreev Bound-states; Josephson; Transport
DOI: 10.21468/SciPostPhys.15.5.214

Citations: 3
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