ISSN:
1432-0630
Schlagwort(e):
PACS: 73.20.-r; 71.20.Dg; 68.35.Bs; 79.60.-i
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Maschinenbau
,
Physik
Notizen:
Abstract. We have investigated the adsorption of Ba on the Si(111) surface at elevated temperatures by using high-resolution electron-energy-loss spectroscopy, low-energy-electron diffraction, and photoelectron spectroscopy with synchrotron photons. We found two new ordered phases 2×1a and 2×1bwith increasing Ba coverage in addition to other ordered phases reported earlier. All the ordered surfaces were found to remain semiconducting with a hybridization band gap of ∼1.1 eV almost independent of Ba coverage. We discuss evidence for the evolution of a Ba s-s hybridization band for Ba coverage beyond 0.5 monolayers and propose structural models for the three ordered phases, which are quite consistent with our experimental data.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/s003390000584
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