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| Home > Publications database > Frustrated frustration and strong vortex pinning in Nb-Pt-Nb Josephson junction arrays > print |
| 001 | 1053027 | ||
| 005 | 20260220104126.0 | ||
| 037 | _ | _ | |a FZJ-2026-01369 |
| 041 | _ | _ | |a English |
| 100 | 1 | _ | |a Schäfer, Christian |0 P:(DE-Juel1)201475 |b 0 |e Corresponding author |
| 111 | 2 | _ | |a Workshop on Innovative Nanoscale Devices and Systems |g WINDS |c Waikoloa |d 2025-12-07 - 2025-12-12 |w USA |
| 245 | _ | _ | |a Frustrated frustration and strong vortex pinning in Nb-Pt-Nb Josephson junction arrays |
| 260 | _ | _ | |c 2025 |
| 336 | 7 | _ | |a Conference Paper |0 33 |2 EndNote |
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| 520 | _ | _ | |a Josephson junctions are among the most important devices in quantum computing, ranging from superconducting qubits to topological protection through Majorana fermions. They are often studied individually, but arranging them on a one- or two-dimensional grid to form a Josephson array allows to leverage collective phenomena. One proposed application is a topologically protected qubit [1]. When a magnetic field is applied in the out-of-plane direction, quantized circular supercurrents known as Josephson vortices appear. An integer or half-integer number of vortices per unit cell (plaquette) form a rigid lattice. Because vortex movement produces a voltage drop across the leads, the DC resistance dips at (half-)integer values of magnetic flux per unit cell, creating a "frustration pattern". A promising type of Josephson junction for Majorana physics is the multi-terminal Josephson junction, which has more than two superconducting electrodes. We study the frustration pattern of a square lattice with in-situ fabricated Nb-Pt-Nb four-terminal Josephson junctions (4TJJ) and compare it to arrays of conventionally fabricated two-terminal junctions (2TJJ) of different sizes. All arrays reproduce the well-studied frustration behavior. Additionally, the 2TJJ arrays exhibit a strongly pinned state at low temperatures. The magnetoresistance of the array is dominated by the Fraunhofer pattern of the individual junctions. The four-terminal geometry produces a checkerboard pattern of alternating fluxes f and f ′ piercing the plaquettes[2]. This type of frustrated frustration manifests as a beating pattern in the DC resistance. Consequently, 4TJJ arrays enable us to estimate the spatial extent of the central weak-link region. This region must be minimized for topological transitions to occur.[1] Ioffe et al., Nature 415, 503 (2002).[2] Teller et al., Arxiv 2503 14423 (2025) |
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| 856 | 4 | _ | |u https://www.eng.auburn.edu/winds/2025/ |
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