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

Marco Valentini (), Maksim Borovkov, Elsa Prada, Sara Martí-Sánchez, Marc Botifoll, Andrea Hofmann, Jordi Arbiol, Ramón Aguado, Pablo San-Jose () and Georgios Katsaros ()
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Marco Valentini: Institute of Science and Technology Austria
Maksim Borovkov: Institute of Science and Technology Austria
Elsa Prada: Instituto de Ciencia de Materiales de Madrid (ICMM), Consejo Superior de Investigaciones Científicas (CSIC)
Sara Martí-Sánchez: Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and BIST
Marc Botifoll: Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and BIST
Andrea Hofmann: Institute of Science and Technology Austria
Jordi Arbiol: Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and BIST
Ramón Aguado: Instituto de Ciencia de Materiales de Madrid (ICMM), Consejo Superior de Investigaciones Científicas (CSIC)
Pablo San-Jose: Instituto de Ciencia de Materiales de Madrid (ICMM), Consejo Superior de Investigaciones Científicas (CSIC)
Georgios Katsaros: Institute of Science and Technology Austria

Nature, 2022, vol. 612, issue 7940, 442-447

Abstract: Abstract Hybrid semiconductor–superconductor devices hold great promise for realizing topological quantum computing with Majorana zero modes1–5. However, multiple claims of Majorana detection, based on either tunnelling6–10 or Coulomb blockade (CB) spectroscopy11,12, 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.

Date: 2022
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DOI: 10.1038/s41586-022-05382-w

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