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Unconventional supercurrent phase in Ising superconductor Josephson junction with atomically thin magnetic insulator

Author(s): Idzuchi, H; Pientka, F; Huang, K-F; Harada, K; Gül, Ö; et al

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Abstract: In two-dimensional (2D) NbSe2 crystal, which lacks inversion symmetry, strong spin-orbit coupling aligns the spins of Cooper pairs to the orbital valleys, forming Ising Cooper pairs (ICPs). The unusual spin texture of ICPs can be further modulated by introducing magnetic exchange. Here, we report unconventional supercurrent phase in van der Waals heterostructure Josephson junctions (JJs) that couples NbSe2 ICPs across an atomically thin magnetic insulator (MI) Cr2Ge2Te6. By constructing a superconducting quantum interference device (SQUID), we measure the phase of the transferred Cooper pairs in the MI JJ. We demonstrate a doubly degenerate nontrivial JJ phase (ϕ), formed by momentum-conserving tunneling of ICPs across magnetic domains in the barrier. The doubly degenerate ground states in MI JJs provide a two-level quantum system that can be utilized as a new dissipationless component for superconducting quantum devices. Our work boosts the study of various superconducting states with spin-orbit coupling, opening up an avenue to designing new superconducting phase-controlled quantum electronic devices.
Publication Date: 9-Sep-2021
Electronic Publication Date: 9-Sep-2021
Citation: Idzuchi, H, Pientka, F, Huang, K-F, Harada, K, Gül, Ö, Shin, YJ, Nguyen, LT, Jo, NH, Shindo, D, Cava, RJ, Canfield, PC, Kim, P. (Unconventional supercurrent phase in Ising superconductor Josephson junction with atomically thin magnetic insulator. Nature Communications, 12 (1), 10.1038/s41467-021-25608-1
DOI: doi:10.1038/s41467-021-25608-1
EISSN: 2041-1723
Language: en
Type of Material: Journal Article
Journal/Proceeding Title: Nature Communications
Version: Final published version. This is an open access article.



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