  Semiconductor-superconductor hybrid nanowires are a leading material platform
for the realization of Majorana zero modes. The semiconductors in previous
studies are dominantly InAs or InSb. In this work, we show the induced
superconductivity in a PbTe nanowire epitaxially coupled to a superconductor
Pb. The Josephson junction device based on this hybrid reveals a gate-tunable
supercurrent in the open regime and a hard superconducting gap in the tunneling
regime. By demonstrating the superconducting proximity effect, our result can
enable Majorana searches and other applications like gate-tunable qubits in a
new semiconductor system.
