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| Autores principales: | , , , |
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| Formato: | Preprint |
| Publicado: |
2026
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| Materias: | |
| Acceso en línea: | https://arxiv.org/abs/2604.24858 |
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| _version_ | 1866913066787012608 |
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| author | Payá, Carlos Robles, César San-Jose, Pablo Prada, Elsa |
| author_facet | Payá, Carlos Robles, César San-Jose, Pablo Prada, Elsa |
| contents | Tunneling spectroscopy cannot be used as an unambiguous detection tool for Majorana zero modes (MZMs) in conventional partial-shell nanowires. The presence of smooth confinement at the end of the hybrid wire (among other sources of disorder) can create exponentially pinned zero-energy states, called quasi-MZMs, that mimic all local signatures of MZMs but lack topological protection. We find that this ambiguity in MZM detection does not occur in full-shell hybrid nanowires, an alternative nanowire design where a superconducting shell fully surrounds the semiconductor core. Acting as a synthetic vortex, a full-shell hybrid nanowire hosts Caroli-de Gennes-Matricon analog states. In the presence of smooth confinement, these states create a topologically trivial skin at the wire's end that prevents the local probe from detecting quasi-MZMs. Conversely, the trivial skin disappears when true MZMs form at the edge. This renders tunneling spectroscopy a reliable MZM detection technique for full-shell hybrid nanowires in the presence of smooth disorder. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_24858 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Absence of Quasi-Majorana False Positives in Full-Shell Hybrid Nanowires Payá, Carlos Robles, César San-Jose, Pablo Prada, Elsa Mesoscale and Nanoscale Physics Tunneling spectroscopy cannot be used as an unambiguous detection tool for Majorana zero modes (MZMs) in conventional partial-shell nanowires. The presence of smooth confinement at the end of the hybrid wire (among other sources of disorder) can create exponentially pinned zero-energy states, called quasi-MZMs, that mimic all local signatures of MZMs but lack topological protection. We find that this ambiguity in MZM detection does not occur in full-shell hybrid nanowires, an alternative nanowire design where a superconducting shell fully surrounds the semiconductor core. Acting as a synthetic vortex, a full-shell hybrid nanowire hosts Caroli-de Gennes-Matricon analog states. In the presence of smooth confinement, these states create a topologically trivial skin at the wire's end that prevents the local probe from detecting quasi-MZMs. Conversely, the trivial skin disappears when true MZMs form at the edge. This renders tunneling spectroscopy a reliable MZM detection technique for full-shell hybrid nanowires in the presence of smooth disorder. |
| title | Absence of Quasi-Majorana False Positives in Full-Shell Hybrid Nanowires |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2604.24858 |