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Supercurrent Interference in Few-Mode Nanowire Josephson Junctions

Abstract : Junctions created by coupling two superconductors via a semiconductor nanowire in the presence of high magnetic fields are the basis for the potential detection, fusion, and braiding of Majorana bound states. We study NbTiN = InSb nanowire = NbTiN Josephson junctions and find that the dependence of the critical current on the magnetic field exhibits gate-tunable nodes. This is in contrast with a well-known Fraunhofer effect, under which critical current nodes form a regular pattern with a period fixed by the junction area. Based on a realistic numerical model we conclude that the Zeeman effect induced by the magnetic field and the spin-orbit interaction in the nanowire are insufficient to explain the observed evolution of the Josephson effect. We find the interference between the few occupied one-dimensional modes in the nanowire to be the dominant mechanism responsible for the critical current behavior. We also report a strong suppression of critical currents at finite magnetic fields that should be taken into account when designing circuits based on Majorana bound states
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Submitted on : Wednesday, June 26, 2019 - 10:45:58 AM
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Kun Zuo, Vincent Mourik, Daniel Szombati, Bas Nijholt, David van Woerkom, et al.. Supercurrent Interference in Few-Mode Nanowire Josephson Junctions. Physical Review Letters, American Physical Society, 2017, 119 (18), pp.187704. ⟨10.1103/PhysRevLett.119.187704⟩. ⟨hal-01921927⟩

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