We report the realization of epitaxial indium thin films on PbTe nanowires. The film is continuous and forms an atomically sharp interface with PbTe. Tunneling devices reveal a hard superconducting gap. The gap size, 1.08–1.18 meV, is twice as large as bulk indium's $(\sim 0.5 \mathrm{meV})$, due to the presence of PbTe. A similar enhancement is also observed in the critical temperature of In on a PbTe substrate. Subgap peaks appear at finite magnetic fields. The effective $g$ factor (15–45) is notably enhanced compared to bare PbTe wires $(<10)$ due to the presence of In, differing from Al hybrids. Josephson devices exhibit gate-tunable supercurrents. The PbTe-In hybrid enhances the properties of both the superconductivity of In and $g$ factors of PbTe, and thus may enable exotic phases of matter such as topological superconductivity.

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• Josephson effect
• Proximity effect
• Superconducting gap
• Superconductivity
• Topological superconductors
• Semiconductors