Majorana-like Coulomb spectroscopy in the absence of zero-bias peaks

Valentini, Marco and Borovkov, Maksim and Prada, Elsa and Martí-Sánchez, Sara and Botifoll, Marc and Hofmann, Andrea and Arbiol, Jordi and Aguado, Ramón and San-Jose, Pablo and Katsaros, Georgios. (2022) Majorana-like Coulomb spectroscopy in the absence of zero-bias peaks. Nature, 612 (7940). pp. 442-447.

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Official URL: https://edoc.unibas.ch/92123/

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Hybrid semiconductor-superconductor devices hold great promise for realizing topological quantum computing with Majorana zero modes; 1-5; . However, multiple claims of Majorana detection, based on either tunnelling; 6-10; or Coulomb blockade (CB) spectroscopy; 11,12; , remain disputed. Here we devise an experimental protocol that allows us to perform both types of measurement on the same hybrid island by adjusting its charging energy via tunable junctions to the normal leads. This method reduces ambiguities of Majorana detections by checking the consistency between CB spectroscopy and zero-bias peaks in non-blockaded transport. Specifically, we observe junction-dependent, even-odd modulated, single-electron CB peaks in InAs/Al hybrid nanowires without concomitant low-bias peaks in tunnelling spectroscopy. We provide a theoretical interpretation of the experimental observations in terms of low-energy, longitudinally confined island states rather than overlapping Majorana modes. Our results highlight the importance of combined measurements on the same device for the identification of topological Majorana zero modes.
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:Nature Research
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:15 Feb 2023 07:39
Deposited On:02 Feb 2023 12:37

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