Transparent Josephson junctions in higher-order topological insulator WTe₂ via Pd diffusion

Endres, Martin and Kononov, Artem and Stiefel, Michael and Wyss, Marcus and Arachchige, Hasitha Suriya and Yan, Jiaqiang and Mandrus, David and Watanabe, Kenji and Taniguchi, Takashi and Schönenberger, Christian . (2022) Transparent Josephson junctions in higher-order topological insulator WTe₂ via Pd diffusion. Physical Review Materials, 6 (8). L081201.

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Official URL: https://edoc.unibas.ch/92581/

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Highly transparent superconducting contacts to a topological insulator (TI) remain a persistent challenge on the route to engineer topological superconductivity. Recently, the higher-order TI WTe2 was shown to turn superconducting when placed on palladium (Pd) bottom contacts, demonstrating a promising material system in pursuing this goal. Here, we report the diffusion of Pd into WTe2 and the formation of superconducting PdTex as the origin of observed superconductivity. We find an atomically sharp interface in the direction vertical to the van der Waals layers between the diffusion crystal and its host crystal, forming state-of-the-art superconducting contacts to a TI. The diffusion is discovered to be nonuniform along the width of the WTe2 crystal, with a greater extent along the edges compared to the bulk. The potential of this contacting method is highlighted in transport measurements on Josephson junctions by employing external superconducting leads.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Experimentalphysik Nanoelektronik (Schönenberger)
UniBasel Contributors:Schönenberger, Christian and Kononov, Artem and Endres, Martin Alexander and Wyss, Marcus
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:09 Feb 2023 09:54
Deposited On:09 Feb 2023 09:54

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