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• W4367182930 endingPage "1482" @default.
• W4367182930 startingPage "1482" @default.
• W4367182930 abstract "We investigate the behavior of the Josephson current in a system composed of a quantum dot (QD) sandwiched between two nanowires by using the nonequilibrium Green's function technique. We consider that the nanowires are in proximity to s-wave superconducror substrates, and Majorana bound states (MBSs) are induced at their ends. It is also assumed that the two nanowires are not aligned in the same orientation, but form a bent angle with respect to each other. It is found that when only one spin state on the QD is coupled to the left nanowire, the Josephson current is the typical sinusoidal function of the phase difference between the two nanowires. If both spin states hybridize to the MBSs with equal coupling strengths, the Josephson current then is not a sinusoidal function of the phase difference. In particular, when the bent angle between the two nanowires is π/2 and the two modes of the MBSs in each nanowire are decoupled from each other, the Josephson current is enhanced by about twenty times in magnitude as compared to the former case. Moreover, the simultaneously enhanced currents of the two spin directions are of the same magnitude but flow in opposite directions and they induce a large pure spin current. Our results also show that this abnormally enhanced Josephson current will be suppressed by a vertical magnetic field applied to the QD." @default.
• W4367182930 created "2023-04-28" @default.
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• W4367182930 date "2023-04-26" @default.
• W4367182930 modified "2023-09-29" @default.
• W4367182930 title "Enhancement of the Josephson Current in a Quantum Dot Connected to Majorana Nanowires" @default.
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• W4367182930 doi "https://doi.org/10.3390/nano13091482" @default.
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