Quantum size effect in ultrathin Au films on the Si(111) surface

Kopciuszyński, M.; Dyniec, P.; Krawiec, Mariusz; Jałochowski, M.; Zdyb, R.

doi:10.1016/j.apsusc.2015.01.089

Cited by 10 publications

(5 citation statements)

References 57 publications

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“…Thus, those spots indicate the (111) oriented Au crystallites. It is not surprising and it has been already reported that the Au film grows on the Si(111) substrate mainly with the (111) face although the presence of other crystallographic orientations has also been reported [33,34]. The observed two Au domains (denoted as Au1 and Au2 in figure 1(b)) are rotated by ±19.3 • ± 1.0 • with respect to the <112> family directions of the underlying Si(111) surface (thus the angle between both Au domains is 38.6 • ).…”

Section: Resultsmentioning

confidence: 86%

Layered heterostructure of planar and buckled phases of silicene

Jaroch¹,

Krawiec²,

Zdyb³

2021

2D Mater.

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Heterostructures made of two-dimensional (2D) materials became a topic of numerous studies due to their new and often unexpected properties. Typically, in such systems 2D structures are composed of various elements. Here, a heterostructure made of different phases of the same material is presented. Layered planar and buckled phases of silicene are prepared in a self-organization process during annealing of ultrathin layers of Au grown on Si(111) surface. Low energy electron microscopy studies show that both phases form continuous parallel layers which are twisted in respect to each other and which cover entire surface of the Au film making an ordered sheet of a size of cm2. Such heterostructures might be important for the development of new electronic and optoelectronic devices.

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Section: Resultsmentioning

confidence: 86%

Layered heterostructure of planar and buckled phases of silicene

Jaroch¹,

Krawiec²,

Zdyb³

2021

2D Mater.

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“…Then it was passivated by Au or Ag, to afford 6 × 6 or √3 × √3 structures. Both reconstructions were used previously to improve the quality of ultrathin gold layers. , The 6 × 6 Au reconstruction was prepared by deposition of 1.5 monolayer (ML) of Au, and the √3 × √3 Ag reconstruction was formed by deposition of 1 ML of Ag onto a clean Si(111) surface. One monolayer of Au or Ag refers to the density of atoms in a half of the bulk terminated Si(111) bilayer (7.84 × 10 14 atoms/cm 2 ).…”

Section: Methodsmentioning

confidence: 99%

“…Both types of bands have already been evidenced previously. 37 In addition, two bands with Dirac-like linear dispersion around the BZ center (Γ point) and crossing of the E F at k = ±0.1 Å −1 are clearly visible. One can notice that Dirac cones meet at the Dirac point (DP) located at E = −0.75 eV, which suggests significant electron doping of the system.…”

mentioning

confidence: 94%

“…Au atoms separate planar and buckled silicene and stabilize the whole structure. The indirect proof for the formation of such layer may also come from chemically sensitive experiments. , In calculations, we disregard the Au(111) slab and the Si(111) substrate, which will basically result in a shift of the energy bands, as discussed in ref . To make the discussion more clear, we further simplify our original model by limiting it to the √3 × √3 surface reconstruction, which is an approximate building block of a more complex real structure …”

mentioning

confidence: 99%

“…The number of QWSs as well as their energy positions depend on the thickness of the Au slab. Both types of bands have already been evidenced previously . In addition, two bands with Dirac-like linear dispersion around the BZ center (Γ point) and crossing of the E F at k = ±0.1 Å –1 are clearly visible.…”

mentioning

confidence: 99%

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Emergent Dirac Fermions in Epitaxial Planar Silicene Heterostructure

Kopciuszyński,

Stȩpniak-Dybala,

Zdyb

et al. 2024

Nano Lett.

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Silicene, a single layer of Si atoms, shares many remarkable electronic properties with graphene. So far, silicene has been synthesized in its epitaxial form on a few surfaces of solids. Thus, the problem of silicene−substrate interaction appears, which usually depresses the original electronic behavior but may trigger properties superior to those of bare components. We report the direct observation of robust Dirac-dispersed bands in epitaxial silicene grown on Au(111) films deposited on Si(111). By performing in-depth angle-resolved photoemission spectroscopy measurements, we reveal three pairs of one-dimensional bands with linear dispersion running in three different directions of an otherwise two-dimensional system. By combining these results with first-principles calculations, we explore the nature of these bands and point to strong interaction between subsystems forming a complex Si−Au heterostructure. These findings emphasize the essential role of interfacial coupling and open a unique materials platform for exploring exotic quantum phenomena and applications in future-generation nanoelectronics.

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Planar Silicene: A New Silicon Allotrope Epitaxially Grown by Segregation

Stpniak‐Dybala

Dyniec

Kopciuszyski

et al. 2019

Adv Funct Materials

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Abstract2D sheets of graphene‐like silicon, namely planar silicene, are synthesized. This new silicon allotrope is prepared on Au(111) thin films grown on a Si(111) substrate in the process of surface segregation. Owing to its almost perfectly flat geometry it shares the atomic structure with graphene rather than with low‐buckled silicene. Scanning tunneling microscopy measurements clearly display an atomically resolved planar silicene honeycomb lattice. Ab initio density functional theory calculations fully support the experimental findings and predict a pure sp2 atomic configuration of Si atoms. The present work is the first experimental evidence of epitaxial planar silicene.

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Quantum size effect in ultrathin Au films on the Si(111) surface

Cited by 10 publications

References 57 publications

Layered heterostructure of planar and buckled phases of silicene

Layered heterostructure of planar and buckled phases of silicene

Emergent Dirac Fermions in Epitaxial Planar Silicene Heterostructure

Planar Silicene: A New Silicon Allotrope Epitaxially Grown by Segregation

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