Selective area grown semiconductor nanowire networks with in-situ superconductor shadow deposition

Abstract

Superconductor-semiconductor (super/semi) nanowire networks provide a rich playground for probing various low-temperature quantum transport phenomenon. In particular, such platforms can be useful for realizing topological quantum computing. A primary bottleneck for achieving high performance in such systems, is the material quality of these nanowires and the pristineness of the semiconductor-superconductor interfaces. In our work, we demonstrate growth of semiconductor nanowires with high mobilities and low defects and also show selective superconductor deposition using in-situ shadow walls. Electron microscopy reveals sharp interfaces and transport measurements show phase coherent transport and hard induced superconducting gaps. This paves a way forward to achieve scalable high quality super/semi networks for realizing complex topological quantum circuits.