Silicene is a phantom material

Sheka, E. F.

doi:10.17586/2220-8054-2016-7-6-983-1001

Cited by 10 publications

(6 citation statements)

References 40 publications

(75 reference statements)

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“…We believe that this feature is on line with other ones related to the tetrel family, such as the absence of both aromatic families of Si and Ge chemical compounds and freestanding honeycomb monolayer silicene and germanene similar to graphene. The feature is caused by an extreme radicalization of the elongated double covalent bonds X=X (X= Si, Ge) [35,36]. Accordingly, from the standpoint of the general concept of amorphicity, monoatomic solid carbon has the unique ability to form amorphous (as well as crystalline) states of two types, characterized by fundamentally different short-range orders presented by either tetrahedral groups of bonded atoms or a honeycomb network of benzenoid units, thus differentiating sp 3 and sp 2 amorphous carbon.…”

Section: The Amorphicity Of Sp 2 Solid Carbonmentioning

confidence: 99%

Graphene Domain Signature of Raman Spectra of sp2 Amorphous Carbons

2020

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The standard D-G-2D pattern of Raman spectra of sp2 amorphous carbons is considered from the viewpoint of graphene domains presenting their basic structure units (BSUs) in terms of molecular spectroscopy. The molecular approximation allows connecting the characteristic D-G doublet spectra image of one-phonon spectra with a considerable dispersion of the C=C bond lengths within graphene domains, governed by size, heteroatom necklace of BSUs as well as BSUs packing. The interpretation of 2D two-phonon spectra reveals a particular role of electrical anharmonicity in the spectra formation and attributes this effect to a high degree of the electron density delocalization in graphene domains. A size-stimulated transition from molecular to quasi-particle phonon consideration of Raman spectra was experimentally traced, which allowed evaluation of a free path of optical phonons in graphene crystal.

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Section: The Amorphicity Of Sp 2 Solid Carbonmentioning

confidence: 99%

Graphene Domain Signature of Raman Spectra of sp2 Amorphous Carbons

2020

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“…We believe that this feature is on line with other exclusivenesses related to the tetrel family, such as the absence of both aromatic families of Si and Ge chemical compounds including fullerenic species, on the one hand, and freestanding honeycomb monolayer silicene and germanene similar to graphene, on the other. The feature is caused by an extreme radicalization of the elongated double covalent bonds X=X (X= Si, Ge) [23,24], which makes the bodies chemically unstable under ambient conditions. Therefore, from the standpoint of general concepts of the solids amorphicity, monoatomic solid carbon has the unique ability to form amorphous (as well as crystalline) states of two types, characterized by fundamentally different short-range orders presented by either tetrahedral sp 3 groups of bonded atoms or an sp 2 honeycomb network of benzenoid units, thus differentiating sp 3 and sp 2 amorphous carbon.…”

Section: Today's Presentation Of Amorphous Carbonmentioning

confidence: 99%

Amorphous state of sp² solid carbon

Sheka

Golubev

Popova

2020

Fullerenes, Nanotubes and Carbon Nanostructures

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Two-mode valence electron configuration of carbon atoms lays the foundation of the unique two-mode amorphous state of the monoatomic carbon solid. From the fundamentals of solid-state physics, sp 3 and sp 2 amorphous carbons are two different amorphous species characterized by conceptually different short-range orders, namely, groups of tetrahedrally bonded sp 3 configured atoms and nanoscale size-restricted sp 2 graphene domains framed with heteroatom necklaces. Molecular character of sp 2 amorphics is coherent with the reaction mechanism of the solid amorphicity in due course of the enforced fragmentation.

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“…Actually, the Dirac-fermion-like behavior of electronic states were observed for monolayers of silicon atoms on Ag(111) surface voluntarily attributed to 'silicene' species [16] (see detailed discussion of the reality and virtuality of silicene in Ref. 17). Similar behavior was predicted for higher tetrels of group 14 elements -germanene and stanene [18].…”

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confidence: 59%

Dirac Material Graphene

Sheka

2018

Reviews on Advanced Materials Science

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The paper presents author's view on spin-rooted properties of graphene supported by numerous experimental and calculation evidences. Correlation of odd p z electrons of the honeycomb lattice meets a strict demand "different orbitals for different spins", which leads to spin polarization of electronic states, on the one hand, and generation of an impressive pool of local spins distributed over the lattice, on the other. These features characterize graphene as a peculiar semimetal with Dirac cone spectrum at particular points of Brillouin zone. However, spin-orbit coupling (SOC), though small but available, supplemented by dynamic SOC caused by electron correlation, transforms graphene-semimetal into graphene-topological insulator (TI). The consequent topological non-triviality and local spins are proposed to discuss such peculiar properties of graphene as high temperature ferromagnetism and outstanding chemical behavior. The connection of these new findings with difficulties met at attempting to convert graphene-TI into semiconductor one is discussed.

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Silicene is a phantom material

Cited by 10 publications

References 40 publications

Graphene Domain Signature of Raman Spectra of sp2 Amorphous Carbons

Graphene Domain Signature of Raman Spectra of sp2 Amorphous Carbons

Amorphous state of sp² solid carbon

Dirac Material Graphene

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Silicene is a phantom material

Cited by 10 publications

References 40 publications

Graphene Domain Signature of Raman Spectra of sp2 Amorphous Carbons

Graphene Domain Signature of Raman Spectra of sp2 Amorphous Carbons

Amorphous state of sp2 solid carbon

Dirac Material Graphene

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Product

Resources

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Amorphous state of sp² solid carbon