Resolving the Ga Ad-Dimer Location and Orientation on the Si(100) Surface

The electronic structures of the Pb-adsorbed Si͑001͒ surface have been studied by angle-resolved photoelectron spectroscopy ͑ARPES͒ using synchrotron radiation. In addition to the evolution of surface electronic states during Pb initial growth at room temperature up to ϳ2 monolayers ͑ML's͒, detailed surface-state band dispersions were investigated for the single-domain 2ϫ2-Pb and 2ϫ1-Pb surfaces occurring at ϳ0.5 and ϳ1.0 ML, respectively. On the 2ϫ2-Pb surface, four surface-state bands were identified within the bulk band gap. The surface band structure of the 2ϫ2-Pb surface is close to that of the Si͑001͒2ϫ2-Al ͑In͒ surface suggesting an overall similarity of their surface structures. While the 2ϫ2-Pb surface is found to be semiconducting with a band gap larger than 0.5 eV, the 2ϫ1-Pb surface is revealed to be metallic with five different surface-state bands. Above 1.0 ML, the ARPES spectra of the Pb/Si͑001͒ surface hardly change with increasing the Pb coverage. The correlation between the surface electronic structures and the intriguing surface structures of different Pb coverages is discussed.

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“…1͑a͔͒. [9][10][11][12][13][14][15][16] However, the Pb chains are reported to consist of buckled parallel dimers ͓Fig. 1͑b͔͒.…”

Section: Introductionmentioning

confidence: 99%

Electronic structure of the Si(001) surface with Pb adsorbates

et al. 2000

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“…For coverages below 0.5 ML, their results strongly favor the parallel model over the orthogonal model. Recent first principles molecular-cluster (DMol) calculations [33,47] (Fig. 2).…”

Section: Ga Adsorption On Siloo1)mentioning

confidence: 99%

“…Recently, we have carried out a series of high-resolution X-ray standing wave (XSW) measurements for group III and V metals (Ga and Sb) chemisorbed on the Si(OO1) surfaces [26,33,34,47]. These measurements, which resolve the atomic structure, bonding geometry, and thermal vibrations for these surfaces will be reviewed within this paper.…”

Section: Introductionmentioning

confidence: 99%

X-ray standing wave investigations of Group III and V metal adsorption on Si(001)

Qian¹,

Bedzyk

Lyman

1997

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X-ray standing waves generated by dynamical Bragg diffraction were used as an elementspecific structural probe for investigating Ga and Sb adsorption on Si(OO1). These high-resolution measurements reveal important quantitative structural information regarding the dimerized surface structures, and prcvide a stringent test for structural models proposed by various theoretical calculations, An overview of the X-ray standing wave technique and its application to surface structure and dynamics is presented.

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“…These rows are constituted by gallium ad-dimers which are aligned parallel to the underlying silicon dimers [7][8][9]. Various sub-half monolayer reconstructions [10] are all formed by ad-dimer rows and differ from each other in the inter-row distances which are governed by repulsive interactions between these rows [7].…”

Section: Introductionmentioning

confidence: 99%