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arXiv · 1902.02773

Ubiquitous non-Majorana Zero-Bias Conductance Peaks in Nanowire Devices

Jun Chen·Benjamin Woods·Peng Yu·Moira Hocevar·Diana Car·Sebastien Plissard·Erik Bakkers·Tudor Stanescu·Sergey Frolov
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Abstract

We perform tunneling measurements on indium antimonide nanowire/superconductor hybrid devices fabricated for the studies of Majorana bound states. At finite magnetic field, resonances that strongly resemble Majorana bound states, including zero-bias pinning, become common to the point of ubiquity. Since Majorana bound states are predicted in only a limited parameter range in nanowire devices, we seek an alternative explanation for the observed zero-bias peaks. With the help of a self-consistent Poission-Schr\"odinger multiband model developed in parallel, we identify several families of trivial subgap states which overlap and interact, giving rise to a crowded spectrum near zero energy and zero-bias conductance peaks in experiments. These findings advance the search for Majorana bound states through improved understanding of broader phenomena found in superconductor-semiconductor systems.

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Jun Chen, Benjamin Woods, Peng Yu, Moira Hocevar, Diana Car, Sebastien Plissard, Erik Bakkers, Tudor Stanescu, Sergey Frolov. 2019-02-07. Ubiquitous non-Majorana Zero-Bias Conductance Peaks in Nanowire Devices. https://doi.org/10.1103/physrevlett.123.107703

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