Current–Phase Relation of a WTe<sub>2</sub> Josephson Junction

Martin Endres; Artem Kononov; Hasitha Suriya Arachchige; Jiaqiang Yan; David Mandrus; Kenji Watanabe; Takashi Taniguchi; Christian Schönenberger

doi:10.1021/acs.nanolett.3c01416

論文 Current–Phase Relation of a WTe₂ Josephson Junction

Martin Endres ; Artem Kononov ; Hasitha Suriya Arachchige ; Jiaqiang Yan ; David Mandrus ; Kenji Watanabe (National Institute for Materials Science) ; Takashi Taniguchi (National Institute for Materials Science) ; Christian Schönenberger

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Martin Endres, Artem Kononov, Hasitha Suriya Arachchige, Jiaqiang Yan, David Mandrus, Kenji Watanabe, Takashi Taniguchi, Christian Schönenberger. Current–Phase Relation of a WTe₂ Josephson Junction. Nano Letters. 2023, 23 (10), 4654-4659. https://doi.org/10.1021/acs.nanolett.3c01416

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Topological insulators (TI) host gapless boundary states that are protected by time-reversal sym- metry against local perturbations. When incorporated into a Josephson junction, the system is predicted to form a chiral superconductor with zero-energy Andreev bound-states. Recently, it was shown that highly transparent superconducting contacts can be formed in the higher-order TI WTe2 by palladium diffusion into the material, forming PdTex. Here, we embed two such Josephson junc- tions into an asymmetric SQUID loop in order to measure the current-phase relation of the weak Josephson junction. The measured critical current is highly affected by inductance effects, despite the loop inductance being negligible. We assign the inductive contribution to the superconduct- ing PdTex. We model our data by maximizing the supercurrent in the SQUID loop and find the 1.5 μm long junction is best described in the short ballistic limit. Our data highlights the complexity of inductance effects that reach beyond the loop inductance and can even give rise to topological signatures in transport measurements.

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