Frustrated Frustration of Arrays with Four-Terminal Nb-Pt-Nb Josephson Junctions
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| Main Authors: | , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866908586092789760 |
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| author | Teller, Justus Schäfer, Christian Moors, Kristof Bennemann, Benjamin Lyatti, Matvey Lentz, Florian Grützmacher, Detlev Riwar, Roman-Pascal Schäpers, Thomas |
| author_facet | Teller, Justus Schäfer, Christian Moors, Kristof Bennemann, Benjamin Lyatti, Matvey Lentz, Florian Grützmacher, Detlev Riwar, Roman-Pascal Schäpers, Thomas |
| contents | 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 checker board 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-flux 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 four-terminal Josephson junction central weak link area. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_14423 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Frustrated Frustration of Arrays with Four-Terminal Nb-Pt-Nb Josephson Junctions Teller, Justus Schäfer, Christian Moors, Kristof Bennemann, Benjamin Lyatti, Matvey Lentz, Florian Grützmacher, Detlev Riwar, Roman-Pascal Schäpers, Thomas Superconductivity 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 checker board 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-flux 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 four-terminal Josephson junction central weak link area. |
| title | Frustrated Frustration of Arrays with Four-Terminal Nb-Pt-Nb Josephson Junctions |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2503.14423 |