TY  - JOUR
AU  - Teller, Justus
AU  - Schäfer, Christian
AU  - Moors, Kristof
AU  - Bennemann, Benjamin
AU  - Lyatti, Matvey
AU  - Lentz, Florian
AU  - Grützmacher, Detlev
AU  - Riwar, Roman-Pascal
AU  - Schäpers, Thomas
TI  - Frustrated Frustration of Arrays with Four-Terminal Nb-Pt-Nb Josephson Junctions
JO  - Physical review letters
VL  - 135
IS  - 15
SN  - 0031-9007
CY  - College Park, Md.
PB  - APS
M1  - FZJ-2025-04108
SP  - 156002
PY  - 2025
N1  - 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)
AB  - 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.
LB  - PUB:(DE-HGF)16
DO  - DOI:10.1103/gxdc-py56
UR  - https://juser.fz-juelich.de/record/1047082
ER  -