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- W4366999440 abstract "The multiterminal Josephson effect aroused considerable interest recently, in connection with theoretical and experimental evidence for correlations among Cooper pairs, that is, the so-called Cooper quartets. It was further predicted that the spectrum of Andreev bound states in such devices could host Weyl-point singularities. However, the relative phase between the Cooper pair and quartet supercurrents has not yet been addressed experimentally. Here, we propose an experiment involving four-terminal Josephson junctions with two independent orthogonal supercurrents, and calculate the critical current contours (CCCs) from a multiterminal Josephson junction circuit theory. We predict a generically $pi$-shifted contribution of both the local or nonlocal second-order Josephson harmonics. Furthermore, we show that these lead to marked nonconvex shapes for the CCCs in zero magnetic field, where the dissipative state reenters into the superconducting one. Eventually, we discuss distinctive features of the non-local Josephson processes in the CCCs. The experimental observation of the latter could allow providing firm evidence of the $pi$-shifted Cooper quartet current-phase relation." @default.
- W4366999440 created "2023-04-27" @default.
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- W4366999440 date "2023-04-22" @default.
- W4366999440 modified "2023-09-28" @default.
- W4366999440 title "Proposal for detecting the $pi-$shifted Cooper quartet supercurrent" @default.
- W4366999440 doi "https://doi.org/10.1103/physrevresearch.5.033124" @default.
- W4366999440 hasPublicationYear "2023" @default.
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