By Seymur Cahangirov, Hasan Sahin, Guy Le Lay, Angel Rubio
This concise e-book bargains a vital creation and reference advisor for the numerous beginners to the sphere of physics of elemental second fabrics. Silicene and similar fabrics are presently one of the so much actively studied fabrics, specially following the 1st experimental synthesis on substrates in 2012. therefore, this primer introduces and studies the main the most important advancements relating to silicene from either theoretical and experimental views. whilst the reader is guided in the course of the wide physique of suitable foundational literature.
The textual content starts off with a quick background of silicene, via a comparability of the bonding nature in silicon as opposed to carbon atoms. the following, an easy yet powerful framework is proven to assist the reader keep on with the thoughts offered during the booklet. The publication then provides the atomic and digital constitution of free-standing silicene, through an account of the experimental awareness of silicene on substrates. This subject is as a result constructed extra to debate a number of reconstructions that silicene acquires as a result of interactions with the substrate and the way such results are reflected within the digital houses. subsequent the ebook examines the dumbbell constitution that's the key to knowing the expansion mechanism and atomic constitution of multilayer silicene. final yet no longer least, it addresses related results in different elemental 2nd fabrics from crew IV (germanene, stanane), workforce V (phosphorene) and staff III (borophene), in addition to transition steel dichalcogenides and different compositions, to be able to offer a basic comparative assessment in their digital properties.
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Extra info for Introduction to the Physics of Silicene and other 2D Materials
There are other experimental results worth mentioning. First, this is the ordered adsorption of seven H atoms per unit cell upon in situ exposure of the 3 3/4 4 phase at room temperature to atomic hydrogen (Qiu et al. 2015). This could be a first step toward silicane synthesis; it proves, in any case, the controllable functionalization of silicene, and, possibly opens a route for tuning magnetic properties (Zheng and Zhang 2012). 2 Growth Mechanism 45 on the other one. Second, it is the observation of large hexagonal patterns with no long rangeporderpbutpremarkable vortices in Low Temperature STM images p of triangular 7 7/ 13 13 domains (Liu et al.
2013). 3c shows the detailed band structure of the silicene/Ag system in the window where the experiments were performed (see Fig. 3b). The blue curve corresponds to the bulk Ag sp-band that should not be detected by ARPES which is sensitive to the surface states. 3d, e show the states that have significant contribution from surface Ag states when silicene is absent and present, respectively. Here one can choose the threshold in such a way that the linear band disappears when silicene is absent and appears when it is present thereby mimicking the situation observed in ARPES experiments.
The 3 3 reconstruction of silicene forms due to the interaction with the Ag substrate and breaks the symmetry needed to preserve the linearly crossing bands at the Fermi level. This is clearly seen in the band structure of the 3 3 reconstructed silicene isolated from the substrate presented in Fig. 3a. Here the band structure of the 3 3 reconstructed silicene is unfolded into the Brillouin zone of the ideal 1 1 silicene. 3 eV gap at the K point. 8 k||(Å-1) 1 Fig. 3 (a) Band structure of reconstructed 3 3 silicene (red dots) in the absence of Ag substrate unfolded to 1 1 Brillouin zone of silicene.