We report on the structural and the electronic properties of Pb atomic chains fabricated on the prepatterned well-ordered Si(553)-Au surface. Using scanning tunneling microscopy/spectroscopy (STM/STS) and angleresolved photoemission (ARPES) supplemented by first-principles density functional theory (DFT) calculations, we show that submonolayer coverage of Pb (0.35 ML) leads to a regular array of several nanometers long double Pb chains. The electronic band structure and the simulated STM topography images obtained from the DFT calculations agree well with the ARPES and STM/STS data.
Using scanning tunneling microscopy/spectroscopy (STM/STS), angle resolved photoemission spectroscopy (ARPES) and first-principles density functional theory (DFT), we study the structural and the electronic properties of the Si(111)5 × 2-Au surface decorated with Pb adatoms. The STM topography data reveal that Pb adatoms form a similar superstructure to that observed in the case of Si adatoms on a bare Si(111)5 × 2-Au surface. The DFT calculations show that preferential adsorption sites of Pb atoms are located near the double Au chain. Bias dependent STM topography and spectroscopy together with the DFT calculations allow us to distinguish Pb from Si adatoms. Both the Si and Pb adatoms modify the electronic properties in the same way, which confirms the electronic origin of the stabilization of the surface.
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