Ubiquitous non-Majorana Zero-Bias Conductance Peaks in Nanowire Devices
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arXiv
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| Format: | Preprint |
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2019
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| author | Chen, Jun Woods, Benjamin Yu, Peng Hocevar, Moira Car, Diana Plissard, Sebastien Bakkers, Erik Stanescu, Tudor Frolov, Sergey |
| author_facet | Chen, Jun Woods, Benjamin Yu, Peng Hocevar, Moira Car, Diana Plissard, Sebastien Bakkers, Erik Stanescu, Tudor Frolov, Sergey |
| contents | 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 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_1902_02773 |
| institution | arXiv |
| publishDate | 2019 |
| record_format | arxiv |
| spellingShingle | Ubiquitous non-Majorana Zero-Bias Conductance Peaks in Nanowire Devices Chen, Jun Woods, Benjamin Yu, Peng Hocevar, Moira Car, Diana Plissard, Sebastien Bakkers, Erik Stanescu, Tudor Frolov, Sergey Mesoscale and Nanoscale Physics 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 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. |
| title | Ubiquitous non-Majorana Zero-Bias Conductance Peaks in Nanowire Devices |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/1902.02773 |