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Condensed Matter > Mesoscale and Nanoscale Physics
Title: Evidence for $π$-shifted Cooper quartets in PbTe nanowire three-terminal Josephson junctions
(Submitted on 29 Dec 2023 (this version), latest version 22 Apr 2024 (v2))
Abstract: Josephson junctions are typically characterized by a single phase difference across two superconductors. This conventional two-terminal Josephson junction can be generalized to a multi-terminal device where the Josephson energy contains terms that result from entanglement of multiple independent phase variables. It was recently proposed that such multi-terminal couplings should result in a $\pi$-shifted quartet supercurrent. We show for the first time experimental signature of this $\pi$-shifted supercurrent, by using a three-terminal Josephson junction based on selective-area-grown PbTe nanowires. We further observe conductance steps at zero magnetic field co-existent with supercurrent in both two- and three-terminal devices, indicating ballistic superconductivity in the few quantum modes regime. Superconducting transport in the few-modes regime is a necessary condition for realizing topologically protected bound states such as Majorana zero modes in one-dimensional nanowires and Weyl nodes in multi-terminal Josephson junctions.
Submission history
From: Mohit Gupta [view email][v1] Fri, 29 Dec 2023 17:41:27 GMT (3400kb,D)
[v2] Mon, 22 Apr 2024 19:52:48 GMT (8356kb,D)
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