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Charge localization and reentrant superconductivity in a quasi-ballistic InAs nanowire coupled to superconductors

AuthorsEstrada Saldaña, J.C.; Žitko, R.; Cleuziou, J.P.; Lee, E.J.H.; Zannier, V.; Ercolani, D.; Sorba, L.; Aguado, Ramón ; De Franceschi, S.
KeywordsSemiconductor nanowires
Issue Date2019
PublisherAmerican Association for the Advancement of Science
CitationScience Advances 5 (2019)
Abstract[EN] A semiconductor nanowire with strong spin-orbit coupling in proximity to a superconductor is predicted to display Majorana edge states emerging under a properly oriented magnetic field. The experimental investigation of these exotic states requires assessing the one-dimensional (1D) character of the nanowire and understanding the superconducting proximity effect in the presence of a magnetic field. Here, we explore the quasi-ballistic 1D transport regime of an InAs nanowire with Ta contacts. Fine-tuned by means of local gates, the observed plateaus of approximately quantized conductance hide the presence of a localized electron, giving rise to a lurking Coulomb blockade effect and Kondo physics. When Ta becomes superconducting, this local charge causes an unusual, reentrant magnetic field dependence of the supercurrent, which we ascribe to a 0 - p transition. Our results underline the relevant role of unintentional charge localization in the few-channel regime where helical subbands and Majorana quasi-particles are expected to arise.
Publisher version (URL)http://dx.doi.org/10.1126/sciadv.aav1235
Identifiersdoi: 10.1126/sciadv.aav1235
e-issn: 2375-2548
Appears in Collections:(ICMM) Artículos
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