Superconductive coupling and Josephson diode effect in selectively-grown topological insulator based three-terminal junctions
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arXiv
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| Auteurs principaux: | , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866916454184517632 |
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| author | Behner, Gerrit Jalil, Abdur Rehman Rupp, Alina Lüth, Hans Grützmacher, Detlev Schäpers, Thomas |
| author_facet | Behner, Gerrit Jalil, Abdur Rehman Rupp, Alina Lüth, Hans Grützmacher, Detlev Schäpers, Thomas |
| contents | The combination of an ordinary s-type superconductor with three-dimensional topological insulators creates a promising platform for fault-tolerant topological quantum computing circuits based on Majorana braiding. The backbone of the braiding mechanism are three-terminal Josephson junctions. It is crucial to understand the transport in these devices for further use in quantum computing applications. We present low-temperature measurements of topological insulator-based three-terminal Josephson junctions fabricated by a combination of selective-area growth of $\mathrm{Bi_{0.8}Sb_{1.2}Te_3}$ and shadow mask evaporation of Nb. This approach allows for the in-situ fabrication of Josephson junctions with an exceptional interface quality, important for the study of the proximity-effect. We map out the transport properties of the device as a function of bias currents and prove the coupling of the junctions by the observation of a multi-terminal geometry induced diode effect. We find good agreement of our findings with a resistively and capacitively shunted junction network model. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_19311 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Superconductive coupling and Josephson diode effect in selectively-grown topological insulator based three-terminal junctions Behner, Gerrit Jalil, Abdur Rehman Rupp, Alina Lüth, Hans Grützmacher, Detlev Schäpers, Thomas Mesoscale and Nanoscale Physics The combination of an ordinary s-type superconductor with three-dimensional topological insulators creates a promising platform for fault-tolerant topological quantum computing circuits based on Majorana braiding. The backbone of the braiding mechanism are three-terminal Josephson junctions. It is crucial to understand the transport in these devices for further use in quantum computing applications. We present low-temperature measurements of topological insulator-based three-terminal Josephson junctions fabricated by a combination of selective-area growth of $\mathrm{Bi_{0.8}Sb_{1.2}Te_3}$ and shadow mask evaporation of Nb. This approach allows for the in-situ fabrication of Josephson junctions with an exceptional interface quality, important for the study of the proximity-effect. We map out the transport properties of the device as a function of bias currents and prove the coupling of the junctions by the observation of a multi-terminal geometry induced diode effect. We find good agreement of our findings with a resistively and capacitively shunted junction network model. |
| title | Superconductive coupling and Josephson diode effect in selectively-grown topological insulator based three-terminal junctions |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2410.19311 |