Si(557)-Ag: A metallic quasi-one-dimensional system
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Bibliographic record
Abstract
A quasi-one-dimensional (1D) system was fabricated by adsorbing one-fifth of a monolayer of Ag onto a Si(557) surface. Structural investigations performed with electron diffraction and scanning tunneling microscopy provided evidence of a midterrace row of Si adatoms with $2\ifmmode\times\else\texttimes\fi{}$ periodicity along $[1\overline{1}0]$, parallel to the step edges. A similar feature is also found in the Si(557)-Au system. Period doubling along $[1\overline{1}0]$ is also found in the Si(557)-Au system. However, the lattice gas of extra Si adatoms, that is a distinctive feature of Si(557)-Au [J. N. Crain et al., Phys. Rev. Lett. 90, 176805 (2003)], is absent in Si(557)-Ag. Inverse photoemission studies of the Si(557)-Ag energy bands revealed a Fermi level crossing parallel to the step edges along $\overline{\ensuremath{\Gamma}K}$ at $0.5\ifmmode\pm\else\textpm\fi{}0.1\phantom{\rule{0.3em}{0ex}}{\mathrm{\AA{}}}^{\ensuremath{-}1}$. In the orthogonal direction $(\overline{\ensuremath{\Gamma}{M}^{\ensuremath{'}}})$, the dispersion of this band is flat, indicating that the adlayer system has a quasi-1D symmetry. Another state with anisotropic dispersion is free-electron-like along $\overline{\ensuremath{\Gamma}K}$ but, once again, flat along $\overline{\ensuremath{\Gamma}{M}^{\ensuremath{'}}}$. This is likely to be an image state that is in resonance with the bulk bands of Si and also perturbed by the quasi-1D surface reconstruction.
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.002 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it