An investigation was made of the electronic structure of the Yb/Si(111)-(3 x 2) surface using angle-resolved photo-electron spectroscopy. Five surface states were identified in the gap of the bulk band projection. Among these five surface states, the dispersions of three of them agreed well with those of the surface states of monovalent atom-adsorbed Si(111)-(3 x 1) surfaces. The dispersions of the two other surface states agreed well with those observed on the Ca/Si(111)-(3 x 2) surface, whose basic structure was the same as that of monovalent atom adsorbed Si(111)-(3 x 1) surfaces. Taking these results into account, it was concluded that the five surface states observed in the band gap originated from the orbitals of Si atoms that formed a honeycomb-chain-channel structure.

Surface Electronic Structure of the (3 x 2) Reconstruction Induced by Yb on a Si(111) Surface. S.Takada, K.Sakamoto, K.Kobayashi, T.Suzuki, A.Harasawa, T.Okuda, T.Kinoshita: Applied Surface Science, 2006, 252[15], 5292-5