Stabilization Of Dense Metallic Pb Monolayer By Decorating Step Edges With Au Atoms On Si(111)
SURFACE SCIENCE(2021)
摘要
Under specific conditions, the sequential growth of Au and Pb on Si(111) results in a huge modification of the surface structure which neither Au/Si nor Pb/Si growths provoke separately. Initially atomically flat 7x7 Si(111) substrate breaks into a terraced-hill structure containing up to 10 atomic terraces of a typical width 10-50 nm. Terraces are covered by a dense monolayer of Pb (nominal coverage 1.2 to 1.33 ML); their step edges are decorated by double rows of Au atoms. This could open a route for constructing superconducting Josephson devices on atomic scale.
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关键词
Lead, Gold, Silicon, Monolayer, Surface relaxation and reconstruction, Surface structure, morphology, Roughness and topography, Scanning tunneling microscopy, Gundlach oscillation
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