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Superconductors with topological surface or edge states have been intensivelyexplored for the prospect of realizing Majorana bound states, which obeynon-Abelian statistics and are crucial for topological quantum computation. Thetraditional routes for making topological insulator/superconductor andsemiconductor/superconductor heterostructures suffer fabrication difficultiesand can only work at low temperature. Here, we use angle-resolved photoemissionspectroscopy to directly observe the evolution of a topological transition ofband structure nearby the Fermi level in two-dimensional high-T$_{c}$superconductor FeTe$_{1-x}$Se$_{x}$/SrTiO$_{3}$(001) monolayers, fullyconsistent with our theoretical calculations. Furthermore, evidence of edgestates is revealed by scanning tunneling spectroscopy with assistance oftheoretical calculations. Our study provides a simple and tunable platform forrealizing and manipulating Majorana states at high temperature.

Observation of topological transition in high-T$_{c}$ superconductor FeTe$_{1-x}$Se$_{x}$/SrTiO$_{3}$(001) monolayers