# Concomitant opening of a bulk-gap with an emerging possible Majorana zero mode

Article · Anna Grivnin, Ella Bor, Moty Heiblum, Yuval Oreg A, Hadas Shtrikman

- Archive id: doi:10.1038/s41467-019-09771-0
- Published: 2019-04-29
- Venue: Nature Communications
- DOI: https://doi.org/10.1038/s41467-019-09771-0
- PMID: 31036841
- Citations: 74
- Source URL: https://doi.org/10.1038/s41467-019-09771-0
- PDF: https://www.nature.com/articles/s41467-019-09771-0.pdf
- Provenance: openalex

## Abstract

Majorana quasiparticles are generally detected in a 1D topological superconductor by tunneling electrons into its edge, with an emergent zero-bias conductance peak (ZBCP). However, such a ZBCP can also result from other mechanisms, hence, additional verifications are required. Since the emergence of a Majorana must be accompanied by an opening of a topological gap in the bulk, two simultaneous measurements are performed: one in the bulk and another at the edge of a 1D InAs nanowire coated with epitaxial aluminum. Only under certain experimental parameters, a closing of the superconducting bulk-gap that is followed by its reopening, appears simultaneously with a ZBCP at the edge. Such events suggest the occurrence of a topologically non-trivial phase. Yet, we also find that ZBCPs are observed under different tuning parameters without simultaneous reopening of a bulk-gap. This demonstrates the importance of simultaneous probing of bulk and edge in the identification of Majorana edge-states.

_Abstract reproduced under CC-BY (publisher license, via OpenAlex)._

Topics: [Topological Superconductivity & Majorana Modes](https://space-kitty.com/topics/topological-superconductivity)

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