|An intriguing lateral proximity effect was discovered from Pb nano-islands. The proximity effect is a central feature of superconducting junctions that plays a key role in many devices and can be exploited in the design of new systems with quantum functionality. Recently, exotic proximity effects have been observed in various systems, including superconductor–metallic nanowires and graphene–superconductor structures. However, it is still not clear how superconducting order propagates spatially in a heterogeneous superconductor system. I will present intriguing junction geometry effects in a heterogeneous system consisting of electronically two-dimensional superconducting islands on a metallic substrate. Depending on the local geometry, the superconducting gap induced at the metallic surface sometimes decays within ~ 20nm of the superconductor, and sometimes survives at distances that are several coherence lengths from a superconductor. I will show in particular that the curvature of the junction plays an essential role in the proximity effect.
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