Chen, J and Woods, BD and Yu, P and Hocevar, M and Car, D and Plissard, SR and Bakkers, EPAM and Stanescu, TD and Frolov, SM
(2019)
Ubiquitous non-Majorana zero-bias conductance peaks in nanowire devices.
Physical Review Letters, 123 (10).
ISSN 0031-9007
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-Schrödinger multiband model developed in parallel, we identify several families of trivial subgap states that 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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