Identifying Majorana vortex modes via non-local transport

Abstract

The combination of two-dimensional Dirac surface states with s-wave superconductivity is expected to generate localized topological Majorana zero modes in vortex cores. Putative experimental signatures of these modes have been reported for heterostructures of proximitized topological insulators, iron-based superconductors or certain transition metal dichalcogenides. Despite these efforts, the Majorana nature of the observed excitation is still under debate. We propose to identify the presence of Majorana vortex modes using a nonlocal transport measurement protocol originally employed for one-dimensional settings. In the case of an isolated subgap state, the protocol provides a spatial map of the ratio of local charge- and probability-density which offers a clear distinction between Majorana and ordinary fermionic modes. We show that these distinctive features survive in the experimentally relevant case of hybridizing vortex core modes.

arXiv comment12 pages, 6 Figures

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Cited by in corpus (6)

• Near zero-energy Caroli-de Gennes-Matricon vortex states in the presence of impurities
• Monolayer superconductivity and tunable topological electronic structure at the Fe(Te,Se)/Bi2Te3 interface
• Thermodynamic transitions and topology of spin-triplet superconductivity: Application to UTe${}_2$
• Statistical Majorana Bound State Spectroscopy
• Excess photon-assisted noise of Majorana and Andreev bound states
• Conductance matrix symmetries of multiterminal semiconductor-superconductor devices