Journal Article

FZJ-2025-04108

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Frustrated Frustration of Arrays with Four-Terminal Nb-Pt-Nb Josephson Junctions

Teller, J. (Corresponding author)FZJ* ; Schäfer, C.FZJ* ; Moors, K. ; Bennemann, B.FZJ* ; Lyatti, M.FZJ* ; Lentz, F.FZJ* ; Grützmacher, D.FZJ* ; Riwar, R.-P.FZJ* ; Schäpers, T. (Corresponding author)FZJ*

2025
APS College Park, Md.

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Please use a persistent id in citations: doi:10.1103/gxdc-py56  doi:10.34734/FZJ-2025-04108

Abstract: We study the frustration pattern of a square lattice with in situ fabricated Nb-Pt-Nb four-terminal Josephson junctions. The four-terminal geometry gives rise to a checkerboard pattern of alternating fluxes f, f' piercing the plaquettes, which stabilizes the Berezinskii-Kosterlitz-Thouless transition even at irrational flux quanta per plaquette, due to an unequal repartition of integer flux sum f + f' into alternating plaquettes. This type of frustrated frustration manifests as a beating pattern of the dc resistance, with state configurations at the resistance dips gradually changing between the conventional zero- and half-flux states. Hence, the four-terminal Josephson junction array offers a promising platform to study previously unexplored flux and vortex configurations and provides an estimate on the spatial expansion of the fourterminal Josephson junction central weak link area.

Keyword(s): Information and Communication (1st) ; Condensed Matter Physics (2nd)

Note: Germany’s Excellence Strategy— Cluster of Excellence Matter and Light for Quantum Computing (ML4Q) EXC 2004/1–390534769,BMBF Quantum Future project “MajoranaChips” (Grant No. 13N15264)Quantum Future project with Grant No. 13N14891Bavaria’s High-Tech Agenda Project “Bausteine für das Quantencomputing auf Basis topologischer Materialien mit experimentellen und theoretischen Ansätzen” (Grant No. 07 02/686 58/1/21 1/22 2/23)

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Contributing Institute(s):

1. Halbleiter-Nanoelektronik (PGI-9)
2. JARA Institut Green IT (PGI-10)
3. Theoretische Nanoelektronik (PGI-2)
4. Helmholtz - Nanofacility (HNF)

Research Program(s):

1. 5222 - Exploratory Qubits (POF4-522) (POF4-522)

Appears in the scientific report 2025

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Electronics and Telecommunications Collection ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Essential Science Indicators ; Nationallizenz ; SCOAP3 sponsored Journal ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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