Gruznev, D.V.D.V.GruznevBondarenko, L.V.L.V.BondarenkoTupchaya, A.Y.A.Y.TupchayaEremeev, S.V.S.V.EremeevMihalyuk, A.N.A.N.MihalyukJYH PIN CHOUWei, C.M.C.M.WeiZotov, A.V.A.V.ZotovSaranin, A.A.A.A.Saranin2024-09-182024-09-182017https://www.scopus.com/record/display.uri?eid=2-s2.0-85000347780&origin=resultslisthttps://scholars.lib.ntu.edu.tw/handle/123456789/721409Structural transformations and evolution of the electron band structure in the (Tl, Pb)/Ge(1 1 1) system have been studied using low-energy electron diffraction, scanning tunneling microscopy, angle-resolved photoelectron spectroscopy and density functional theory calculations. The two 2D Tl-Pb compounds on Ge(1 1 1), √3 × √3-(Tl, Pb) and 3 × 3-(Tl, Pb), have been found and their composition, atomic arrangement and electron properties has been characterized. The (Tl, Pb)/Ge(1 1 1) √3 × √3 compound is almost identical to the alike (Tl, Pb)/Si(1 1 1) √3 × √3 system from the viewpoint of its atomic structure and electronic properties. They contain 1.0 ML of Tl atoms arranged into a honeycomb network of chained trimers and 1/3 ML of Pb atoms occupying the centers of the honeycomb units. The (Tl, Pb)/Ge(1 1 1)3 × 3 compound contains six Tl atoms and seven Pb atoms per 3 × 3 unit cell (i.e. ∼0.67 ML Tl and ∼0.78 ML Pb). Its atomic structure can be visualized as consisting of Pb hexagons surrounded by Tl trimers. The (Tl, Pb)/Ge(1 1 1) √3 × √3 and (Tl, Pb)/Ge(1 1 1) 3 × 3 compounds are metallic and their band structures contain spin-split surface-state bands. By analogy with the (Tl, Pb)/Si(1 1 1) √3 × √3, these (Tl, Pb)/Ge(1 1 1) compounds are believed to be promising objects for prospective studies of superconductivity in one-atom-layer systems. © 2016 IOP Publishing Ltd.2D layerARPESatom-solid interactionDFT calculationselectronic structureSTMjournal article10.1088/0953-8984/29/3/0350012-s2.0-85000347780