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arXiv · 1904.03783

Supercurrent detection of topologically trivial zero-energy states in nanowire junctions

Oladunjoye A. Awoga·Jorge Cayao·Annica M. Black-Schaffer
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Abstract

We report the emergence of zero-energy states in the trivial phase of a short nanowire junction with strong spin-orbit coupling and magnetic field, formed by strong coupling between the nanowire and two superconductors. The zero-energy states appear in the junction when the superconductors induce a large energy shift in the nanowire, such that the junction naturally forms a quantum dot, a process that is highly tunable by the superconductor width. Most importantly, we demonstrate that the zero-energy states produce a $\pi$-shift in the phase-biased supercurrent, which can be used as a simple tool for their unambiguous detection, ruling out any Majorana-like interpretation.

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Oladunjoye A. Awoga, Jorge Cayao, Annica M. Black-Schaffer. 2019-04-08. Supercurrent detection of topologically trivial zero-energy states in nanowire junctions. https://doi.org/10.1103/physrevlett.123.117001

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