Evidence of electron confinement in the single-domain (4×1)-In superstructure on vicinal Si(111)

Pedreschi, F.; O’Mahony, John F.; Weightman, P.; Power, J. R.

doi:10.1063/1.122407

Cited by 32 publications

(32 citation statements)

References 21 publications

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“…These results contrast with RAS studies of this system, which show a dominant anisotropic linear polarizability in the surface plane perpendicular to the chains [14], and they underline the complementary information available from linear and nonlinear surface optical probes. The results also contrast with previous studies of another candidate for quasi-one-dimensional metallicity, the single domain Si(111)±5 Â 2-Au structure [15 to 17].…”

Section: Resultscontrasting

confidence: 72%

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Optical Second Harmonic Generation Studies of Indium Deposited on Vicinal Si(111)

Chandola¹,

McGilp²

1999

phys. stat. sol. (a)

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Optical second harmonic generation (SHG), using 1064 nm excitation, has been used to probe the electronic structure of the single‐domain In‐induced 4 × 1 reconstruction of vicinal Si(111). Deposition of less than 1 monolayer of In onto a stepped Si(111) surface, held at 450 °C under ultra‐high vacuum conditions, produced a single domain 4 × 1 structure with the In chains aligned with the [‐110] step edges. On formation of the single domain Si(111)–4 × 1‐In structure, the s‐polarized SH response showed a large, anisotropic change. The nonlinear susceptibility along the chains, parallel to the step edges, increased by a factor of about 2.5 over that of Si(111)–7 × 7, while the change in the susceptibility in the surface plane perpendicular to the step edges was very small. Recent reflection anisotropy spectroscopy (RAS) studies of the same system found a dominant linear susceptibility in the surface plane perpendicular to the step edges, which was attributed to electron confinement effects. SHG and RAS are providing different, and complementary, information about this system. The SHG results are consistent with quasi‐one‐dimensional metallicity along the chains, evidence for which is seen in photoemission and inverse photoemission studies of the single domain Si(111)–4 × 1‐In structure.

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Section: Resultscontrasting

confidence: 72%

“…Recent reflection anisotropy spectroscopy (RAS) studies, however, revealed a very large anisotropy at 1.9 eV, in a direction perpendicular to the In-induced chains and step edges [14]. This was interpreted in terms of electronic confinement perpendicular to the steps.…”

Section: Resultsmentioning

confidence: 97%

Optical Second Harmonic Generation Studies of Indium Deposited on Vicinal Si(111)

Chandola¹,

McGilp²

1999

phys. stat. sol. (a)

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“…1). The negative, broad, composite feature is very similar to features observed in other metalinduced chain-like structures: RA spectra of Si(111)-(4 × 1)-In [12,15], Si(111)-(5 × 2)-Au [16] and Si(111)-(3 × 1)-Ca [17] are shown in Fig. 2.…”

Section: Methodssupporting

confidence: 58%

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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“…40,41 RAS measurements of the Si͑111͒ : In-͑4 ϫ 1͒ date back to 1998 and can only be done on the vicinal Si͑111͒ surfaces that force single domain formation. 13 The RAS spectrum ͑Fig. 7͒ is dominated by a strong interband transition at 2 eV.…”

Section: Atomic Nanowiresmentioning

confidence: 99%

“…10,11 The main structures in the RAS spectra arise from transitions between surface states or surface modified bulk states. RAS is well suited for the analysis of metallic nanowires and has proved to be a useful tool in monitoring nanowire formation 12,13 or Peierls driven metal-insulator transitions in metallic nanowires.…”

Section: Introductionmentioning

confidence: 99%

Free-electron response in reflectance anisotropy spectra

et al. 2006

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Reflectance anisotropy spectra ͑RAS͒, extended into the near infrared spectral region, of anisotropic metal islands, metal surfaces, and atomic nanowires are analyzed with respect to anisotropies in the optical response of the free-electron gas of such low dimensional metal structures. In order to distinguish conductivity and morphology effects, both a phenomenological anisotropic Drude model and an effective medium model using ellipsoidal metal inclusions are used to model the spectra. In some cases ͑metal islands͒ the RAS response is dominated by the free-electron contribution, while this contribution is significantly smaller for the metal surfaces and nanowires in the accessible spectral range.

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Evidence of electron confinement in the single-domain (4×1)-In superstructure on vicinal Si(111)

Cited by 32 publications

References 21 publications

Optical Second Harmonic Generation Studies of Indium Deposited on Vicinal Si(111)

Optical Second Harmonic Generation Studies of Indium Deposited on Vicinal Si(111)

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

Free-electron response in reflectance anisotropy spectra

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