A topological superconductor tuned by electronic correlations.

ABSTRACT: A topological superconductor, characterized by either a chiral order parameter or a topological surface state in proximity to bulk superconductivity, is foundational to topological quantum computing. A key open challenge is whether electron-electron interactions can tune such topological superconducting phases. Here, we provide experimental signatures of a unique topological superconducting phase in competition with electronic correlations in 10-unit-cell thick FeTe_xSe_1-x films grown on SrTiO₃ substrates. When the Te content x exceeds 0.7, we observe a topological transition marked by the emergence of a superconducting surface state. Near the FeTe limit, the system undergoes another transition where the surface state disappears, and superconductivity is sup

SUBMITTER: Lin H 

PROVIDER: S-EPMC12858962 | biostudies-literature | 2025 Dec

REPOSITORIES: biostudies-literature