Angle-resolved photoemission from an unusual quasi-one-dimensional metallic system: a single domain Au-induced 5 × 2 reconstruction of Si(111)

Collins, I. R.; Moran, J.T.; Andrews, P T; Cosso, R.; O’Mahony, John F.; McGilp, J. F.; Margaritondo, G.

doi:10.1016/0039-6028(94)00735-7

Cited by 58 publications

(30 citation statements)

References 14 publications

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“…Si(111) and its vicinal surfaces, in particular, have shown a variety of chain structures after depositing a submonolayer of metal atoms. Indium [1] and Au ( [2,3] and references therein) form quasi-one-dimensional (1D) metallic chains but semiconducting structures can also be formed. One of the best known of these latter metalinduced reconstructions is the Si(111)-(3 × 1)-X structure, which is formed by various adsorbates, X, such as alkali metals (Li, Na, K), alkaline-earth metals (Mg, Ca, Ba), rare-earth metals (Sm, Yb), and Ag, at a coverage of 1/3 monolayer (ML).…”

Section: Introductionmentioning

confidence: 99%

Optical response of Ag‐induced reconstructions on vicinal Si(111)

Chandola

Jacob

Fleischer

et al. 2005

Physica Status Solidi (b)

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The optical response of the Si(111)-(3 × 1) -Ag surface has been studied for the first time with reflectance anisotropy spectroscopy (RAS). A single domain surface was obtained by depositing <1 ML of Ag onto a vicinal Si(111) substrate at 870 K. A significant optical anisotropy develops around 2.2 eV which is related to the formation of the 3 × 1 structure. This surface was then used as a template to grow onedimensional (1D) arrays of Ag nanodots, and also 3D Ag islands, by depositing 0.5 ML, and higher, coverages of Ag at room temperature. RAS of these structures showed a different response in the 2.2 eV region, with a broadened and reduced anisotropy. By extending the RA spectra into the infra-red region (0.5 -1.5 eV), substantial differences between the structures were observed below 1 eV, which may be linked to a difference in the metallic character of the nanodots and islands.

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Section: Introductionmentioning

confidence: 99%

Optical response of Ag‐induced reconstructions on vicinal Si(111)

Chandola

Jacob

Fleischer

et al. 2005

Physica Status Solidi (b)

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“…46,48,53,54,55,56,57,58,59,60,61 These studies have led to important insights into the electronic structure of this complicated surface and provide tests complementary to STM for evaluating structural models. In this section we address three aspects of the electronic structure of Si (111)-(5×2)-Au: the detailed mechanism that drives the period doubling discussed in Sec.…”

Section: Electronic Structurementioning

confidence: 99%

Structure and energetics ofSi(111)−(5×2)-Au

2009

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We propose a new structural model for the Si(111)-(5×2)-Au reconstruction. The model incorporates a new experimental value of 0.6 monolayer for the coverage of gold atoms, equivalent to six gold atoms per 5×2 cell. Five main theoretical results, obtained from first-principles total-energy calculations, support the model. (1) In the presence of silicon adatoms the periodicity of the gold rows spontaneously doubles, in agreement with experiment. (2) The dependence of the surface energy on the adatom coverage indicates that a uniformly covered phase is unstable and will phase-separate into empty and covered regions, as observed experimentally. (3) Theoretical scanning tunneling microscopy images are in excellent agreement with experiment. (4) The calculated band structure is consistent with angle-resolved photoemission spectra; analysis of their correspondence allows the straightforward assignment of observed surface states to specific atoms. (5) The calculated activation barrier for diffusion of silicon adatoms along the row direction is in excellent agreement with the experimentally measured barrier.

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“…1 Introduction Gold-induced reconstructions on the Si(111) surface have attracted considerable interest, in particular the Au-induced (5×2) reconstruction due to its quasi one-dimensional nature [1][2][3][4][5][6][7][8][9]. The model for Si(111)-5×2-Au is still under discussion, although all models consist of a Au double row and Si zig-zag chains, with some more recent models including isolated Si adatoms on the Au chains [9,10].…”

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confidence: 99%

Reflectance anisotropy studies of 5×2‐Au structures grown on Si(111) surfaces with different step formations

Jacob

McAlinden

Fleischer

et al. 2008

Phys. Status Solidi (c)

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Reflection anisotropy spectroscopy (RAS) studies are reported of Si(111)‐5×2‐Au structures grown on substrates with different offcuts and step densities. Such substrates produce a predominant domain on the (111) terrace that would otherwise produce a negligible RAS signal, due to domain averaging. Changes in the RAS spectra with offcut angle are observed in the 1 to 3 eV region, where Au‐induced structures appear. Results from offcuts towards [$ {\bar 1}{\bar 1} $2] of 2°, 3°, 9.5°, and ‐4° are presented. The variation in the RAS spectra is consistent with different populations of single‐ and double‐chain gold structures formed in the region of the steps. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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Angle-resolved photoemission from an unusual quasi-one-dimensional metallic system: a single domain Au-induced 5 × 2 reconstruction of Si(111)

Cited by 58 publications

References 14 publications

Optical response of Ag‐induced reconstructions on vicinal Si(111)

Optical response of Ag‐induced reconstructions on vicinal Si(111)

Structure and energetics ofSi(111)−(5×2)-Au

Reflectance anisotropy studies of 5×2‐Au structures grown on Si(111) surfaces with different step formations

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