Parametric exploration of zero-energy modes in three-terminal InSb-Al nanowire devices

Abstract

We systematically study three-terminal InSb-Al nanowire devices by using radio-frequency reflectometry. Tunneling spectroscopy measurements on both ends of the hybrid nanowires are performed while systematically varying the chemical potential, magnetic field and junction transparencies. Identifying the lowest-energy state allows for the construction of lowest- and zero-energy state diagrams, which show how the states evolve as a function of the aforementioned parameters. Importantly, comparing the diagrams taken for each end of the hybrids enables the identification of states which do not coexist simultaneously, ruling out a significant amount of the parameter space as candidates for a topological phase. Furthermore, altering junction transparencies filters out zero-energy states sensitive to a local gate potential. Such a measurement strategy significantly reduces the time necessary to identify a potential topological phase and minimizes the risk of falsely recognizing trivial bound states as Majorana zero modes.

arXiv commentMain text: 12 pages, 9 figures. SupplementaryMaterials: 12 pages, 14 figures

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• Electrostatic control of the proximity effect in the bulk of semiconductor-superconductor hybrids
• Topological characterization and stability of Floquet Majorana modes in Rashba nanowire
• Differential current noise as an identifier of Andreev bound states that induce nearly quantized conductance plateaus
• Charge sensing the parity of an Andreev molecule
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• Random matrix theory for the robustness, quantization, and end-to-end correlation of zero-bias conductance peaks in a class D ensemble
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• Spin-resolved nonlocal transport in proximitized Rashba nanowires
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• A hierarchy in Majorana non-abelian tests and hidden variable models