WFRF:(Thiagarajan P)
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Atomic and electronic structure of the Yb/Ge(111)-(3x2) surface studied by high-resolution photoelectron spectroscopy
- Kuzmin, M. (author)
- Schulte, K. (author)
- Laukkanen, P. (author)
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- Ahola-Tuomi, M. (author)
- Perala, R. E. (author)
- Vayrynen, I. J. (author)
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- (creator_code:org_t)
- 2007
- 2007
- English.
- In: Physical Review B (Condensed Matter and Materials Physics). - 1098-0121. ; 75
- Journal article (peer-reviewed)
Abstract
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- 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.
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- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
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- Kuzmin, M.
- Schulte, K.
- Laukkanen, P.
- Ahola-Tuomi, M.
- Perala, R. E.
- Adell, Martin
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- Lund University
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