%0 Journal Article
%A Teller, Justus
%A Schäfer, Christian
%A Moors, Kristof
%A Bennemann, Benjamin
%A Lyatti, Matvey
%A Lentz, Florian
%A Grützmacher, Detlev
%A Riwar, Roman-Pascal
%A Schäpers, Thomas
%T Frustrated Frustration of Arrays with Four-Terminal Nb-Pt-Nb Josephson Junctions
%J Physical review letters
%V 135
%N 15
%@ 0031-9007
%C College Park, Md.
%I APS
%M FZJ-2025-04108
%P 156002
%D 2025
%Z 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)
%X 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.
%F PUB:(DE-HGF)16
%9 Journal Article
%R 10.1103/gxdc-py56
%U https://juser.fz-juelich.de/record/1047082