Missing Shapiro steps in topologically trivial Josephson Junction on InAs quantum well
| Autor: | Javad Shabani, Matthieu C. Dartiailh, Bassel Heiba Elfeky, William Mayer, Enrico Rossi, Joseph Yuan, Kaushini Wickramasinghe, Joseph Cuozzo |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Josephson effect
Current (mathematics) Science FOS: Physical sciences General Physics and Astronomy Context (language use) 02 engineering and technology 01 natural sciences Article General Biochemistry Genetics and Molecular Biology Superconducting properties and materials Quantum mechanics Condensed Matter::Superconductivity Mesoscale and Nanoscale Physics (cond-mat.mes-hall) 0103 physical sciences 010306 general physics Quantum well Superconductivity Coupling Physics Multidisciplinary Condensed Matter - Mesoscale and Nanoscale Physics General Chemistry Fermion 021001 nanoscience & nanotechnology Condensed Matter::Mesoscopic Systems and Quantum Hall Effect MAJORANA Superconducting devices 0210 nano-technology |
| Zdroj: | Nature Communications, Vol 12, Iss 1, Pp 1-9 (2021) Nature Communications |
| Popis: | Josephson junctions hosting Majorana fermions have been predicted to exhibit a 4π periodic current phase relation. One experimental consequence of this periodicity is the disappearance of odd steps in Shapiro steps experiments. Experimentally, missing odd Shapiro steps have been observed in a number of materials systems with strong spin-orbit coupling and have been interpreted in the context of topological superconductivity. Here we report on missing odd steps in topologically trivial Josephson junctions fabricated on InAs quantum wells. We ascribe our observations to the high transparency of our junctions allowing Landau-Zener transitions. The probability of these processes is shown to be independent of the drive frequency. We analyze our results using a bi-modal transparency distribution which demonstrates that only few modes carrying 4π periodic current are sufficient to describe the disappearance of odd steps. Our findings highlight the elaborate circumstances that have to be considered in the investigation of the 4π Josephson junctions in relationship to topological superconductivity. Recent observations of missing odd Shapiro steps have been interpreted in the context of topological superconductivity. Here, the authors observe missing odd Shapiro steps in topologically trivial Josephson junctions due to high transparency of the junctions, calling for caution in relationship to topological superconductivity. |
| Databáze: | OpenAIRE |
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