Surface electronic structure of ordered alkali- and noble metal-overlayers on Si(111)

Some progresses of our photoemission studies for ordered metal/Si(111) surfaces are reviewed. The 5-6-7 model having π-bonded chain structure on the alkali metal (AM) induced Si(111)3 × 1 surfaces is strongly suggested from the comparison between our results of angle resolved photoelectron spectroscopy (ARPES) and recently reported theoretical calculations. We also focus on the difference of the Si 2p surface core level shifts (SCLS) between Ag induced- and AM induced-Si(111)3 × 1 surfaces. Finally, we discuss the electronic and geometric structures of the Si(111)5 × 2, View the MathML source, View the MathML source and 6 × 6-Au surfaces from our ARPES and SCLS studies.