Evidence of Silicene in Honeycomb Structures of Silicon on Ag(111)

Feng, Baojie; Ding, Zijing; Meng, Sheng; Yao, Yugui; He, Xiaoyue; Cheng, Peng; Chen, Lan; Wu, Kehui

doi:10.1021/nl301047g

Cited by 1,238 publications

(1,225 citation statements)

References 29 publications

(62 reference statements)

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“…The intriguing structural, electronic, and optical properties of many two-dimensional (2D) materials similar to graphene such as the transition-metal dichalcogenides [1][2][3], group IV elements [4,5], and group III-V based 2D materials [6][7][8] have motivated further research for new discoveries. Owing to its attractive intrinsic properties such as high carrier mobility, direct band gap, and superior optical properties, phosphorene has been widely in focus [9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Optical properties of single-layer and bilayer arsenene phases

2016

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An extensive investigation of the optical properties of single-layer buckled and washboard arsenene and their bilayers was performed, starting from layered three-dimensional crystalline phase of arsenic using density functional and many-body perturbation theories combined with random phase approximation. Electron-hole interactions were taken into account by solving the Bethe-Salpeter equation, suggesting first bound exciton energies on the order of 0.7 eV. Thus, many-body effects were found to be crucial for altering the optical properties of arsenene. The light absorption of single-layer and bilayer arsenene structures in general falls within the visible-ultraviolet spectral regime. Moreover, directional anisotropy, varying the number of layers, and applying homogeneous or uniaxial in-plane tensile strain were found to modify the optical properties of two-dimensional arsenene phases, which could be useful for diverse photovoltaic and optoelectronic applications.

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Section: Introductionmentioning

confidence: 99%

Optical properties of single-layer and bilayer arsenene phases

2016

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“…The RB split is expected to decrease with decreasing atomic number, and in the case of Sn, no split could be observed [3]. Apart from studies of surface alloys, Ag(111) has a central role as a substrate in the formation of graphene (C) [4] and silicene (Si) [5,6]. Ge is similar to the lighter group IV elements, C and Si, in the sense that it crystallizes in the diamond structure with an sp 3 hybridization of the valence electrons.…”

Section: Introductionmentioning

confidence: 99%

Broken symmetry induced band splitting in theAg2Gesurface alloy on Ag(111)

et al. 2014

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We report a study of the atomic and electronic structures of the ordered Ag 2 Ge surface alloy containing ⅓ monolayer of Ge. Low-energy electron diffraction (LEED), scanning tunneling microscopy (STM), and angle-resolved photoelectron spectroscopy (ARPES) data reveal a symmetry breaking of the expected Ý3 × Ý3 periodicity, which is established for other Ag 2 M alloys (M = Bi, Sb, Pb, and Sn). The deviation from a simple Ý3 × Ý3 structure manifests itself as a splitting of diffraction spots in LEED, as a striped structure with a 6× periodicity including a distortion of the local hexagonal structure in STM, and as a complex surface band structure in ARPES that is quite different from those of the other Ag 2 M alloys. These results are interesting in view of the differences in the atomic and electronic structures exhibited by different group IV elements interacting with Ag(111). Pb and Sn form Ý3 × Ý3 surface alloys on Ag(111), of which Ag 2 Pb shows a surface band structure with a clear spin-orbit split. Si and C form silicene and graphene structures, respectively, with linear band dispersions and the formation of Dirac cones as reported for graphene. The finding that Ag 2 Ge deviates from the ideal (Ý3 × Ý3) Ag 2 Sn and Ag 2 Pb surface alloys makes Ge an interesting "link" between the heavy group IV elements (Sn, Pb) and the light group IV elements (Si, C).

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“…Recently, single-layer thick sp 2 and sp 3 group IV systems have attracted considerable theoretical and experimental interest. [14][15][16][17] It has been previously shown that layered Zintl phases such as CaSi2 and CaGe2 can be topochemically deintercalated in aqueous HCl at low temperatures to produce layered silicon and germanium solids. [18][19][20] The resultant four-coordinate puckered lattice of Si and Ge atoms has an analogous geometry to sp 3 -hybridized graphane, or a Si/Ge(111) surface in which every Si/Ge atom is terminated with either -H or -OH above or below the layer.…”

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confidence: 99%

Stability and Exfoliation of Germanane: A Germanium Graphane Analogue

et al. 2013

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Graphene's success has shown that it is not only possible to create stable, single-atom thick sheets from a crystalline solid, but that these materials have fundamentally different properties than the parent material. We have synthesized for the first time, mm-scale crystals of a hydrogen-terminated germanium multilayered graphane analogue (germanane, GeH) from the topochemical deintercalation of CaGe2. This layered van der Waals solid is analogous to multilayered graphane (CH). The surface layer of GeH only slowly oxidizes in air over the span of 5 months, while the underlying layers are resilient to oxidation based on X-ray Photoelectron Spectroscopy (XPS) and Fourier Transform Infrared Spectroscopy (FTIR) measurements. The GeH is thermally stable up to 75 o C, however, above this temperature amorphization and dehydrogenation begin to occur. These sheets can be mechanically exfoliated as single and few layers onto SiO2/Si surfaces. This material represents a new class of covalently terminated graphane analogues and has great potential for a wide range of optoelectronic and sensing applications, especially since theory predicts a direct band gap of 1.53 eV and an electron mobility ~five times higher than that of bulk Ge.iii Acknowledgements

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Evidence of Silicene in Honeycomb Structures of Silicon on Ag(111)

Cited by 1,238 publications

References 29 publications

Optical properties of single-layer and bilayer arsenene phases

Optical properties of single-layer and bilayer arsenene phases

Broken symmetry induced band splitting in theAg2Gesurface alloy on Ag(111)

Stability and Exfoliation of Germanane: A Germanium Graphane Analogue

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