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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 cou- pled to an s-wave superconductor , several tun- neling experiments reported characteristic Majo- rana 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 prop- erties inaccessible . Here, we show character- istic Majorana signatures in InSb nanowire de- vices exhibiting clear ballistic transport proper- ties. Application of a magnetic field and spatial control of carrier density using local gates gen- erates a zero bias peak that is rigid over a large region in the parameter space of chemical poten- tial, Zeeman energy, and tunnel barrier potential. The reduction of disorder allows us to resolve sep- arate 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 alter- native explanations that invoke disorder or a nonuniform chemical potential
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Contributor : Sébastien Plissard <>
Submitted on : Tuesday, February 20, 2018 - 9:27:48 AM
Last modification on : Thursday, June 10, 2021 - 3:03:15 AM

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Önder Gül, Hao Zhang, Jouri Bommer, Michiel de Moor, Diana Car, et al.. Ballistic Majorana nanowire devices. Nature Nanotechnology, Nature Publishing Group, 2018, 13 (3), pp.192-197. ⟨10.1038/s41565-017-0032-8⟩. ⟨hal-01712989⟩



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