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- W3183267145 abstract "Josephson junctions with topological insulators as their weak link (S-TI-S junctions) are predicted to host Majorana fermions, which are key to creating qubits for topologically protected quantum computing. But the details of the S-TI-S current-phase relation and its interplay with magnetic fields are not well understood. We fabricate a Bi2Se3 junction with NbTi leads and measure the Fraunhofer patterns of the junction with applied in-plane fields. We observe that asymmetric Fraunhofer patterns appear in the resistance maps of Bz vs. Bx,y, with aperiodic node spacings. These asymmetric patterns appear even at zero parallel field and for temperatures up to 1 K. The anomalous features are compared to asymmetric Fraunhofer patterns expected for finite Cooper pair momentum shifts as well as geometric effects. We show that the geometric effects can dominate, independent of in-plane field magnitude. These results are important for differentiating geometrical phase shifts from those caused by Cooper pair momentum shifting, Majorana mode signatures, or other unconventional superconducting behavior." @default.
- W3183267145 created "2021-08-02" @default.
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- W3183267145 date "2021-08-06" @default.
- W3183267145 modified "2023-10-10" @default.
- W3183267145 title "Asymmetric Fraunhofer spectra in a topological insulator-based Josephson junction" @default.
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- W3183267145 doi "https://doi.org/10.1088/1361-648x/ac15d7" @default.
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