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DS: Fachverband Dünne Schichten
DS 12: Poster
DS 12.20: Poster
Mittwoch, 29. März 2023, 17:00–19:00, P3
Encapsulating high-temperature superconducting twisted van der waals heterostructures blocks detrimental effects of disorder — •Yejin Lee1,2, Mickey Martini1,2, Tommaso Confalone1, Sanaz Shokri1,2, Christian Saggau1, Daniel Wolf1, Genda Gu3, Kenji Watanabe4, Takashi Taniguchi4, Domenico Montemurro5, Valerii Vinokur6, Kornelius Nielsch1,2, and Nicola Poccia1 — 1IFW Dresden, Dresden, Germany — 2TU Dresden, Dresden, Germany — 3Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, NY, USA — 4NIMS, Tsukuba, Japan — 5University of Naples Federico II, Naples, Italy — 6Terra Quantum AG, Gallen, Switzerland
Van der Waals (vdW) heterostructures based on cuprate superconductors attract substantial interest of novel topological phases as well as technological applications. One of the hindrances for the progress is the detrimental effect of disorder on the properties of the vdW devices-based Josephson junctions. This work reports a novel method of fabricating twisted vdW heterostructures made of Bi2Sr2CuCa2O8+x, combining the employed cryogenic stacking using a solvent-free stencil mask technique and additionally covering the interface with insulating hexa boron nitride layers. We find that encapsulating the interface in the stacked systems overcomes detrimental effects of disorder providing highly coherent Josephson junction. This finding enables crucial improvement of its critical current and the Tc of the junctions up to their magnitudes in bulk intrinsic junctions.