Ferroelectric tuning of superconductivity and band topology in a two-dimensional heterobilayer

Ferroelectricity, superconductivity, and topology are three cornerstone concepts of condensed matter physics, and integration of any two may further fertilize exotic emergent phenomena. To date, harmonic coexistence of all three remains to be materialized. Here, the authors predict simultaneous tuning of superconducting transition temperature and band topology by ferroelectricity, with a heterobilayer of superconducting IrTe₂ and ferroelectric In₂Se₃ as a physically realistic example. Such reversible and nonvolatile tunabilities may find important applications in novel superconducting devices and topological quantum computation.