Evidence of Topological Edge States in Buckled Antimonene Monolayers

Two-dimensional topologicalmaterials have attracted intense research efforts owing to their promise in applications for low-energy, high-efficiency quantum computations. Group-VA elemental thin films with strong spin–orbit coupling have been predicted to host topologicallynontrivial states as excellent two-dimensional topologicalmaterials. Herein, we experimentally demonstrated for the first time that the epitaxially grown high-quality antimonene monolayer islands with buckled configurations exhibit significantly robust one-dimensional topologicaledge states above the Fermi level. We further demonstrated that these topologicallynontrivial edge states arise from a single p-orbital manifold as a general consequence of atomic spin–orbit coupling. Thus, our findings establish monolayer antimonene as a new class of topologicalmonolayer materials hosting the topologicaledge states for future low-power electronic nanodevicesand quantum computations.