Twisted van der Waals Josephson junction based on high-Tc superconductor

Abstract

Stacking two-dimensional van der Waals (vdW) materials rotated with respect to each other show versatility for the study of exotic quantum phenomena. Especially, anisotropic layered materials have great potential for such twistronics applications, providing high tunability. Here, we report anisotropic superconducting order parameters in twisted Bi2Sr2CaCu2O8+x (Bi-2212) vdW junctions with an atomically clean vdW interface, achieved using the microcleave-and-stack technique. The vdW Josephson junctions with twist angles of 0° and 90° showed the maximum Josephson coupling, which was comparable to that of intrinsic Josephson (IJ) junctions in the bulk crystal. As the twist angle approaches 45°, Josephson coupling is suppressed, and eventually disappears at 45°. The observed twist angle dependence of the Josephson coupling can be explained quantitatively by theoretical calculation with the d-wave superconducting order parameter of Bi-2212 and finite tunneling incoherence of the junction. Our results revealed the anisotropic nature of Bi-2212 and provided a novel fabrication technique for vdW-based twistronics platforms compatible with air-sensitive vdW materials.

arXiv comment24 pages, 6 figures, to be published in Nano Letters

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Cited by in corpus (19)

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• Prominent Josephson tunneling between twisted single copper oxide planes of Bi${}_2$Sr${}_{2-x}$LaxCuO${}_{6+y}$
• Twisted multilayer nodal superconductors
• Twisted-bilayer FeSe and the Fe-based superlattices
• Cuprate Twistronics for Quantum Hardware
• Doping dependence of chiral superconductivity in near $45^{\circ }$ twisted bilayer cuprates
• Tuning topological superconductivity within the $t$-$J$-$U$ model of twisted bilayer cuprates
• Site-selective insulating phase in twisted bilayer Hubbard model
• ${\varphi }_0$-junction and Josephson diode effect in high-temperature superconductor
• Topological phases in twisted Rashba superconductors
• Twisted Nodal Superconductors
• Angular dependence of the upper critical induction of clean $s$- and $d_{x^2-y^2}$-wave superconductors with self-consistent ellipsoidal effective mass and Zeeman anisotropies
• Pre-Patterned Superconducting Contacts for Clean Superconductor-Topological Material Interfaces Enabling Long-Range Josephson Coupling
• Gap structure and phase diagram of twisted bilayer cuprates from a microscopic perspective
• Incoherent tunneling and topological superconductivity in twisted cuprate bilayers