Atomic and electronic structure of the Yb/Ge(111)-(3x2) surface studied by high-resolution photoelectron spectroscopy
Journal Article
·
· Physical Review. B, Condensed Matter and Materials Physics
- Department of Physics, University of Turku, FIN-20014 Turku (Finland)
- School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD (United Kingdom)
- MAX-lab, Lund University, SE-221 00 Lund (Sweden)
Using high-resolution synchrotron-radiation photoelectron spectroscopy and low-energy electron diffraction, we have studied the electronic and structural properties of the Yb-induced Ge(111)-(3x2) reconstruction with a 1/6 monolayer coverage. We found these properties to be similar in many respects to those of the metal-induced Si(111) and Ge(111) reconstructions described previously in terms of the honeycomb chain-channel (HCC) structure. In particular, the Yb/Ge(111)-(3x2) is revealed to have a semiconducting character, the Yb atoms are divalent, and the surface states observed for the Yb/Ge(111) closely resemble those of the Na/Ge(111)-(3x1) in the literature. The Ge 3d core-level analysis, however, shows that the Ge 3d spectra from Yb/Ge(111)-(3x2) drastically differ from corresponding spectra of other Si and Ge HCC reconstructions. An atomic model, based on the general HCC geometry, is proposed for the Yb/Ge(111)-(3x2) surface. In this model, the important structural aspects are a buckling of the Ge=Ge double bond in the top, HCC-reconstructed layer plus a strong rearrangement of the second-layer atoms.
- OSTI ID:
- 20957818
- Journal Information:
- Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 16 Vol. 75; ISSN 1098-0121
- Country of Publication:
- United States
- Language:
- English
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