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

Idzuchi, H.; Pientka, F.; Huang, K. -F.; Harada, K.; Gül, Ö.; Shin, Y. J.; Nguyen, L. T.; Jo, N. H.; Shindo, D.; Cava, R. J.; Canfield, P. C.; Kim, P.

doi:10.1038/s41467-021-25608-1

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

Journal Article · Thu Sep 09 00:00:00 EDT 2021 · Nature Communications

DOI:https://doi.org/10.1038/s41467-021-25608-1· OSTI ID:1819400

Idzuchi, H.;

; Huang, K. -F.; Harada, K.;

;

; Nguyen, L. T.; Jo, N. H.; Shindo, D.; Cava, R. J.; Canfield, P. C.;

Abstract In two-dimensional (2D) NbSe ₂ 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 NbSe ₂ ICPs across an atomically thin magnetic insulator (MI) Cr ₂ Ge ₂ Te ₆ . 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.

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Research Organization:: Ames Lab., Ames, IA (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division

Grant/Contract Number:: SC0019300; AC02-07CH11358; FG02-98ER45706

OSTI ID:: 1819400

Alternate ID(s):: OSTI ID: 1819750

Report Number(s):: IS-J-10,589; 5332; PII: 25608

Journal Information:: Nature Communications, Journal Name: Nature Communications Vol. 12 Journal Issue: 1; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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