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001053027 041__ $$aEnglish
001053027 1001_ $$0P:(DE-Juel1)201475$$aSchäfer, Christian$$b0$$eCorresponding author
001053027 1112_ $$aWorkshop on Innovative Nanoscale Devices and Systems$$cWaikoloa$$d2025-12-07 - 2025-12-12$$gWINDS$$wUSA
001053027 245__ $$aFrustrated frustration and strong vortex pinning in Nb-Pt-Nb Josephson junction arrays
001053027 260__ $$c2025
001053027 3367_ $$033$$2EndNote$$aConference Paper
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001053027 520__ $$aJosephson 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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001053027 65027 $$0V:(DE-MLZ)SciArea-120$$2V:(DE-HGF)$$aCondensed Matter Physics$$x0
001053027 65017 $$0V:(DE-MLZ)GC-120-2016$$2V:(DE-HGF)$$aInformation and Communication$$x0
001053027 7001_ $$0P:(DE-Juel1)190635$$aTeller, Justus$$b1
001053027 7001_ $$0P:(DE-Juel1)161192$$aBennemann, Benjamin$$b2
001053027 7001_ $$0P:(DE-Juel1)180184$$aMoors, Kristof$$b3
001053027 7001_ $$0P:(DE-Juel1)180691$$aLyatti, Matvey$$b4
001053027 7001_ $$0P:(DE-Juel1)130795$$aLentz, Florian$$b5
001053027 7001_ $$0P:(DE-Juel1)168366$$aRiwar, Roman$$b6
001053027 7001_ $$0P:(DE-Juel1)128634$$aSchäpers, Thomas$$b7
001053027 8564_ $$uhttps://www.eng.auburn.edu/winds/2025/
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001053027 9141_ $$y2025
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001053027 9201_ $$0I:(DE-Juel1)HNF-20170116$$kHNF$$lHelmholtz - Nanofacility$$x2
001053027 9201_ $$0I:(DE-Juel1)PGI-2-20110106$$kPGI-2$$lTheoretische Nanoelektronik$$x3
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