Ballistic Majorana nanowire devices

Abstract

Majorana modes are zero-energy excitations of a topological superconductor that exhibit non-Abelian statistics. Following proposals for their detection in a semiconductor nanowire coupled to an s-wave superconductor, several tunneling experiments reported characteristic Majorana signatures. Reducing disorder has been a prime challenge for these experiments because disorder can mimic the zero-energy signatures of Majoranas, and renders the topological properties inaccessible. Here, we show characteristic Majorana signatures in InSb nanowire devices exhibiting clear ballistic transport properties. Application of a magnetic field and spatial control of carrier density using local gates generates a zero bias peak that is rigid over a large region in the parameter space of chemical potential, Zeeman energy, and tunnel barrier potential. The reduction of disorder allows us to resolve separate regions in the parameter space with and without a zero bias peak, indicating topologically distinct phases. These observations are consistent with the Majorana theory in a ballistic system, and exclude for the first time the known alternative explanations that invoke disorder or a nonuniform chemical potential.

See https://doi.org/10.5281/zenodo.4721357 for source data. No changes in this version (v3) compared to the previous version (v2)

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Cited by in corpus (232)

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• Selective Area Grown Semiconductor-Superconductor Hybrids: A Basis for Topological Networks
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• Electric field tunable superconductor-semiconductor coupling in Majorana nanowires
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• Helical Liquids in Semiconductors
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• Majorana-Kondo interplay in T-shaped double quantum dots
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• Majorana modes in emergent-wire phases of helical and cycloidal magnet-superconductor hybrids
• In Situ Epitaxy of Pure Phase Ultra-Thin InAs-Al Nanowires for Quantum Devices
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• Majorana Braiding in Realistic Nanowire Y-Junctions and Tuning Forks
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• Bosonization for fermions and parafermions
• Probing Majorana zero modes by measuring transport through an interacting magnetic impurity
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