Realization of tunable superconductivity with concomitant nontrivial band topology is conceptually intriguing and highly desirable for next-generation nanoscale superconducting devices. Based on first-principles calculations, here we present a prediction of simultaneously tunable superconducting transition temperature ($T_{\mathrm{c}}$) and band topology in a superconducting $\mathrm{Ir}{\mathrm{Te}}_2$ overlayer on a ferroelectric ${\mathrm{In}}_2{\mathrm{Se}}_3$ monolayer. We first demonstrate that the $T_{\mathrm{c}}$ is substantially enhanced from that of $\mathrm{Ir}{\mathrm{Te}}_2$ nanoflakes ($T_{\mathrm{c}}\sim 3$ K) due to significant charge repartitioning around the Fermi level. More importantly, the $T_{\mathrm{c}}$ is shown to sensitively depend on the ${\mathrm{In}}_2{\mathrm{Se}}_3$ polarization, with the higher $T_{\mathrm{c}}$ of $\sim$(8–10) K attributed to enhanced interlayer electron-phonon coupling when the polarization is downward. The band topology is also switched from trivial to nontrivial as the polarization is reversed from upward to downward. These findings provide physically realistic platforms for simultaneously tuning superconductivity and band topology in two-dimensional heterobilayers and related heterostructures using a reversible and nonvolatile approach, with immense application potential for superconducting diodes and topological quantum computation.

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• Cellular bilayers
• Ferroelectricity
• First-principles calculations
• Superconducting phase transition
• Topological phase transition
• 2-dimensional systems
• Heterostructures
• Low-temperature superconductors
• Superconducting devices
• Density functional theory