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Title: | Charge localization and reentrant superconductivity in a quasi-ballistic InAs nanowire coupled to superconductors |
Authors: | Estrada Saldaña, J.C.; Žitko, R.; Cleuziou, J.P.; Lee, E.J.H.; Zannier, V.; Ercolani, D.; Sorba, L.; Aguado, Ramón ![]() |
Keywords: | Semiconductor nanowires Spin-orbit Superconductors |
Issue Date: | 2019 |
Publisher: | American Association for the Advancement of Science |
Citation: | Science 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 |
URI: | http://hdl.handle.net/10261/211321 |
DOI: | 10.1126/sciadv.aav1235 |
Identifiers: | doi: 10.1126/sciadv.aav1235 e-issn: 2375-2548 |
Appears in Collections: | (ICMM) Artículos |
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Estrada_Charge_Sci_Advances_eaav1235.full.pdf | 1,92 MB | Adobe PDF | ![]() View/Open |
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