Silicene on Ag(111) : domains and local defects of the observed superstructures

Jamgotchian, H.; Colignon, Yann; Ealet, B.; Parditka, Bence; Hoarau, Jean-Yves; Girardeaux, Christophe; Aufray, B.; Bibérian, Jean-Paul

doi:10.1088/1742-6596/491/1/012001

Cited by 25 publications

(32 citation statements)

References 15 publications

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“…However, as mentioned above, only highly defective STM images have been shown until now, [13][14][15] bearing strong similarity with the one we have recorded at low temperature, which is displayed in Fig. 2 along with the inserted image simulated by Guo et al, for a hypothetical ideal…”

supporting

confidence: 81%

The fate of the 2√3 × 2√3R(30°) silicene phase on Ag(111)

et al. 2014

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Silicon atoms deposited on Ag(111) produce various single layer silicene sheets with different buckling patterns and periodicities. Low temperature scanning tunneling microscopy reveals that one of the silicene sheets, the hypothetical √7 × √7 silicene structure, on 2√3 × 2√3 Ag(111), is inherently highly defective and displays no long-range order. Moreover, Auger and photoelectron spectroscopy measurements reveal its sudden death, to end, in a dynamic fating process at ∼300 °C. This result clarifies the real nature of the 2√3 × 2√3R(30°) silicene phase and thus helps to understand the diversity of the silicene sheets grown on Ag(111).

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supporting

confidence: 81%

The fate of the 2√3 × 2√3R(30°) silicene phase on Ag(111)

et al. 2014

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“…The sign of the angle shift is directly relative to the sign of . When two domains with < 0, and > 0 are simultaneously observed on the same STM image, the angle between both domains will be equal to twice the angle shift as it has been shown in the figure 9 of [22].…”

Section: Generalization Of the Modelmentioning

confidence: 76%

A comprehensive study of the (2√3 × 2√3)R30° structure of silicene on Ag(1 1 1)

Jamgotchian

Ealet

Colignon

et al. 2015

J. Phys.: Condens. Matter

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Abstract. The deposition of one silicon monolayer on Ag(111) gives rise to a set of superstructures depending on growth conditions. These superstructures are correlated to the epitaxy between the honeycomb structure of silicon (so called silicene) and the silver substrate.In this paper, from a detailed re-analysis of experimental results, obtained by Scanning Tunneling Microscopy and by Low Energy Electron Diffraction on the (2√3x2√3)R30° structure, we propose a new atomic model of the silicene layer based on periodic arrangements of perfect areas of (2√3x2√3)R30° surrounded by defect areas. A generalization of this model explains the main experimental observations: deviation of the average direction, Moiré patterns and apparent global disorder. In the frame of the proposed model, the apparent disorders observed on the STM images, would be topological effects, i.e. the silicene would keep a quasi-perfect honeycomb structure.

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“…However, only experimental observations of highly defective "23 u 23R(30°)" superstructures obtained at high temperatures (~300° C) have been reported [21]. The notation within " " is adopted here to indicate that this is not a real 23 u 23R(30°) superstructure, as already underlined by Moras et al [22].…”

Section: The Claimed Highly Perfectmentioning

confidence: 98%

Silicene phases on Ag(111)

Lay

Cahangirov

Xian

et al. 2014

2014 International Conference on Manipulation, Manufacturing and Measurement on the Nanoscale (3m-Nano)

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Silicene, an atom-thin two-dimensional sheet of silicon atoms arranged in a honeycomb lattice, recently synthesized on Ag(111), has attracted considerable interest as a potential alternative to graphene. For single layer silicene, two main phases have been identified among a few possible ones. They correspond to differently buckled silicene sheets, in coincidence either with 4x4 or Root13xRoot13R(13.9°) silver (111) supercells. Instead, we demonstrate via surface crystallography considerations and Density Functional Theory calculations that a previously claimed, 2Root3x2Root3R(30°) Ag(111) superstructure cannot accommodate a true honeycomb silicon sheet.

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Silicene on Ag(111) : domains and local defects of the observed superstructures

Cited by 25 publications

References 15 publications

The fate of the 2√3 × 2√3R(30°) silicene phase on Ag(111)

The fate of the 2√3 × 2√3R(30°) silicene phase on Ag(111)

A comprehensive study of the (2√3 × 2√3)R30° structure of silicene on Ag(1 1 1)

Silicene phases on Ag(111)

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