Subgap spectroscopy along hybrid nanowires by nm-thick tunnel barriers.
Journal
Nature communications
ISSN: 2041-1723
Titre abrégé: Nat Commun
Pays: England
ID NLM: 101528555
Informations de publication
Date de publication:
20 Oct 2023
20 Oct 2023
Historique:
received:
15
03
2023
accepted:
11
10
2023
medline:
21
10
2023
pubmed:
21
10
2023
entrez:
20
10
2023
Statut:
epublish
Résumé
Tunneling spectroscopy is widely used to examine the subgap spectra in semiconductor-superconductor nanostructures when searching for Majorana zero modes (MZMs). Typically, semiconductor sections controlled by local gates at the ends of hybrids serve as tunnel barriers. Besides detecting states only at the hybrid ends, such gate-defined tunnel probes can cause the formation of non-topological subgap states that mimic MZMs. Here, we develop an alternative type of tunnel probes to overcome these limitations. After the growth of an InSb-Al hybrid nanowire, a precisely controlled in-situ oxidation of the Al shell is performed to yield a nm-thick AlOx layer. In such thin isolating layer, tunnel probes can be arbitrarily defined at any position along the hybrid nanowire by shadow-wall angle-deposition of metallic leads. In this work, we make multiple tunnel probes along single nanowire hybrids and successfully identify Andreev bound states (ABSs) of various spatial extension residing along the hybrids.
Identifiants
pubmed: 37863952
doi: 10.1038/s41467-023-42422-z
pii: 10.1038/s41467-023-42422-z
pmc: PMC10589238
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
6647Informations de copyright
© 2023. Springer Nature Limited.
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