Absence of Quasi-Majorana False Positives in Full-Shell Hybrid Nanowires

Abstract

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 state analogs. 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. In this way, the same mechanism that creates MZM impostors makes them invisible in tunneling spectroscopy, avoiding false positives produced by smooth disorder.

14 pages, 4 figures, 8 appendices. Final version

References in corpus (39)

• Non-Abelian Anyons and Topological Quantum Computation
• Signatures of Majorana fermions in hybrid superconductor-semiconductor nanowire devices
• Majorana Fermions and a Topological Phase Transition in Semiconductor-Superconductor Heterostructures
• Evidence of Majorana fermions in an Al - InAs nanowire topological superconductor
• Observation of Majorana Fermions in a Nb-InSb Nanowire-Nb Hybrid Quantum Device
• Majorana bound states in a coupled quantum-dot hybrid-nanowire system
• Scaling of Majorana Zero-Bias Conductance Peaks
• Transport spectroscopy of NS nanowire junctions with Majorana fermions
• Towards a realistic transport modeling in a superconducting nanowire with Majorana fermions
• Search for Majorana fermions in multiband semiconducting nanowires
• InAs-Al Hybrid Devices Passing the Topological Gap Protocol
• SNS junctions in nanowires with spin-orbit coupling: role of confinement and helicity on the sub-gap spectrum
• Flux-induced topological superconductivity in full-shell nanowires
• Non-Majorana states yield nearly quantized conductance in superconductor-semiconductor nanowire devices
• Disorder-induced zero-bias peaks in Majorana nanowires
• Nontopological zero-bias peaks in full-shell nanowires induced by flux tunable Andreev states
• Majorana nanowires for topological quantum computation
• Estimating disorder and its adverse effects in semiconductor Majorana nanowires
• Local and non-local quantum transport due to Andreev bound states in finite Rashba nanowires with superconducting and normal sections
• Finite-size effects in a nanowire strongly coupled to a thin superconducting shell
• Trivial Andreev band mimicking topological bulk gap reopening in the non-local conductance of long Rashba nanowires
• Presence versus absence of end-to-end nonlocal conductance correlations in Majorana nanowires: Majorana bound states versus Andreev bound states
• Destructive Little-Parks Effect in a Full-Shell Nanowire-based Transmon
• Electronic structure of full-shell InAs/Al hybrid semiconductor-superconductor nanowires: Spin-orbit coupling and topological phase space
• X-shaped and Y-shaped Andreev resonance profiles in a superconducting quantum dot
• Theory of Caroli-de Gennes-Matricon analogs in full-shell hybrid nanowires
• Andreev Modes from Phase Winding in a Full-shell Nanowire-based Transmon
• Majorana-like localized spin density without bound states in topologically trivial spin-orbit coupled nanowires
• Multiple topological transitions driven by the interplay of normal scattering and Andreev scattering
• Phenomenology of Majorana zero modes in full-shell hybrid nanowires
• Fluxoid-induced pairing suppression and near-zero modes in quantum dots coupled to full-shell nanowires
• Josephson effect and critical currents in trivial and topological full-shell hybrid nanowires
• Effect of topological length on Bound states signatures in a Topological nanowire
• Absence of Majorana oscillations in finite-length full-shell hybrid nanowires
• Subgap transport in superconductor--semiconductor hybrid islands: Weak and strong coupling regimes
• InP/GaSb core-shell nanowires: a novel hole-based platform with strong spin-orbit coupling for full-shell hybrid devices
• Caroli-de Gennes-Matricon Analogs in Full-Shell Hybrid Nanowires
• Fluxoid valve effect in full-shell nanowire Josephson junctions
• Majorana zero modes in semiconductor-superconductor hybrid structures: Defining topology in short and disordered nanowires through Majorana splitting