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Article Dans Une Revue Science Advances Année : 2019

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

Résumé

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 - $\pi$ 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.
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hal-03541773 , version 1 (25-01-2022)

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Paternité - Pas d'utilisation commerciale

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J. Estrada Saldaña, R. Žitko, J. Cleuziou, E. Lee, V. Zannier, et al.. Charge localization and reentrant superconductivity in a quasi-ballistic InAs nanowire coupled to superconductors. Science Advances , 2019, 5 (7), pp.eaav1235. ⟨10.1126/sciadv.aav1235⟩. ⟨hal-03541773⟩
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