Magnetic-Field-Independent Subgap States in Hybrid Rashba Nanowires

Juenger, Christian and Delagrange, Raphaelle and Chevallier, Denis and Lehmann, Sebastian and Dick, Kimberly A. and Thelander, Claes and Klinovaja, Jelena and Loss, Daniel and Baumgartner, Andreas and Schoenenberger, Christian. (2020) Magnetic-Field-Independent Subgap States in Hybrid Rashba Nanowires. Physical Review Letters, 125 (1). 017701.

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Official URL: https://edoc.unibas.ch/80685/

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Subgap states in semiconducting-superconducting nanowire hybrid devices are controversially discussed as potential topologically nontrivial quantum states. One source of ambiguity is the lack of an energetically and spatially well defined tunnel spectrometer. Here, we use quantum dots directly integrated into the nanowire during the growth process to perform tunnel spectroscopy of discrete subgap states in a long nanowire segment. In addition to subgap states with a standard magnetic field dependence, we find topologically trivial subgap states that are independent of the external magnetic field, i.e., that are pinned to a constant energy as a function of field. We explain this effect qualitatively and quantitatively by taking into account the strong spin-orbit interaction in the nanowire, which can lead to a decoupling of Andreev bound states from the field due to a spatial spin texture of the confined eigenstates. This result constitutes an important step forward in the research on superconducting subgap states in nanowires, such as Majorana bound states.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Theoretical Nano/Quantum Physics (Klinovaja)
UniBasel Contributors:Klinovaja, Jelena
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Physical Society
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:06 Apr 2022 13:31
Deposited On:29 Apr 2021 15:16

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