Nontopological zero-bias peaks in full-shell nanowires induced by flux-tunable Andreev states

Valentini, Marco and Penaranda, Fernando and Hofmann, Andrea and Brauns, Matthias and Hauschild, Robert and Krogstrup, Peter and San-Jose, Pablo and Prada, Elsa and Aguado, Ramon and Katsaros, Georgios. (2021) Nontopological zero-bias peaks in full-shell nanowires induced by flux-tunable Andreev states. Science, 373 (6550). pp. 82-88.

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Official URL: https://edoc.unibas.ch/85267/

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A semiconducting nanowire fully wrapped by a superconducting shell has been proposed as a platform for obtaining Majorana modes at small magnetic fields. In this study, we demonstrate that the appearance of subgap states in such structures is actually governed by the junction region in tunneling spectroscopy measurements and not the full-shell nanowire itself. Short tunneling regions never show subgap states, whereas longer junctions always do. This can be understood in terms of quantum dots forming in the junction and hosting Andreev levels in the Yu-Shiba-Rusinov regime. The intricate magnetic field dependence of the Andreev levels, through both the Zeeman and Little-Parks effects, may result in robust zero-bias peaks-features that could be easily misinterpreted as originating from Majorana zero modes but are unrelated to topological superconductivity.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Experimental Quantum Computing with Semiconductors (Hofmann)
UniBasel Contributors:Hofmann, Andrea
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Association for the Advancement of Science
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:28 Jan 2022 10:43
Deposited On:28 Jan 2022 10:43

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