4.8 Article

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

Journal

NATURE
Volume 612, Issue 7940, Pages 442-+

Publisher

NATURE PORTFOLIO
DOI: 10.1038/s41586-022-05382-w

Keywords

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Funding

  1. Scientific Service Units of ISTA
  2. NOMIS Foundation
  3. CSIC Interdisciplinary Thematic Platform (PTI+) on Quantum Technologies (PTI-QTEP+)
  4. Generalitat de Catalunya [2017 SGR 327]
  5. Spanish MINECO [SEV-2017-0706]
  6. CERCA Programme/Generalitat de Catalunya
  7. European Union's Horizon 2020 research and innovation programme [823717-ESTEEM3]
  8. MCIN
  9. European Union NextGenerationEU [PRTR-C17.I1)]
  10. Generalitat de Catalunya
  11. Recovery and Resilience Facility of the European Union
  12. MCIN/AEI [PGC2018-097018-BI00, PCI2018-093026, PID2020-116093RB-C43]
  13. 'ERDF A way of making Europe', by the European Union
  14. SUR Generalitat de Catalunya
  15. EU Social Fund [2020 FI 00103]
  16. [H2020-MSCA-IF-2018/844511]

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Hybrid semiconductor-superconductor devices have great potential for realizing topological quantum computing with Majorana zero modes. However, the detection of Majorana modes based on either tunnelling or Coulomb blockade spectroscopy is still disputable. In this study, we propose an experimental protocol that allows us to perform both types of measurement on the same hybrid island, effectively reducing ambiguities in Majorana detections.
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.

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