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

Abstract:

: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 - π 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.

journal_name

Sci Adv

journal_title

Science advances

authors

Estrada Saldaña JC,Žitko R,Cleuziou JP,Lee EJH,Zannier V,Ercolani D,Sorba L,Aguado R,De Franceschi S

doi

10.1126/sciadv.aav1235

subject

Has Abstract

pub_date

2019-07-05 00:00:00

pages

eaav1235

issue

7

issn

2375-2548

pii

aav1235

journal_volume

5

pub_type

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