Surface diffusion of Pb atoms on the Si(553)-Au surface in narrow quasi-one-dimensional channels

Nita, Paweł; Palotás, Krisztián; Jałochowski, M.; Krawiec, Mariusz

doi:10.1103/physrevb.89.165426

Cited by 15 publications

(17 citation statements)

References 43 publications

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“…Thus, growing silicene may be challenging due to the tendency of Si atoms for clustering. Another problem is related to the high mobility of Pb atoms on Si surfaces, even at room temperature [64][65][66]. Therefore, experimental attempts to grow silicene on Pb-induced Si(111) reconstructions should be done at low temperatures.…”

Section: Resultsmentioning

confidence: 99%

Silicene Nanoribbons on Pb-Reconstructed Si(111) Surface

2016

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We report on the initial stage of growing of silicon nanostructures on Pb-induced √ 3 × √ 3 and √ 3 × √ 7 reconstructed Si(111) surfaces. The deposition of 0.75 monolayer of Si at a temperature of around 200 K results in Si nanoribbons a few-nanometers in length running in three equivalent high symmetry directions of Si(111) surface, as revealed by low temperature scanning tunneling microscopy measurements. The nanoribbons are predominantly 1.6 nm wide and show local √ 3 × √ 3 reconstruction. These findings are interpreted within the framework of silicene nanoribbons grown on a bare Si(111) surface.

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Section: Resultsmentioning

confidence: 99%

Silicene Nanoribbons on Pb-Reconstructed Si(111) Surface

2016

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“…The NRs consist of Si atoms directly adsorbed on the Si(111) surface, as it was argued in [ 47 ], based on geometry considerations and STM measurements. It is also known, that Pb atoms strongly diffuse on Si substrates [ 53 – 54 ], so they can easily make room for growing Si NRs. Furthermore, different STS characteristics acquired on top of the NRs and in between them also point against Pb-composed nanoribbons.…”

Section: Resultsmentioning

confidence: 99%

Structural model of silicene-like nanoribbons on a Pb-reconstructed Si(111) surface

Stȩpniak-Dybala¹,

Krawiec²

2017

Beilstein J. Nanotechnol.

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A structural model of the recently observed silicene-like nanoribbons on a Pb-induced √3 × √3 reconstructed Si(111) surface is proposed. The model, which is based on first principles density functional theory calculations, features a deformed honeycomb structure directly bonded to the Si(111) surface underneath. Pb atoms stabilize the nanoribbons, as they passivate the uncovered substrate, thus lower the surface energy, and suppress the nanoribbon–substrate interaction. The proposed structural model reproduces well all the experimental findings.

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“…Recently, the 3D-WKB method was successfully applied in a number of theoretical [15][16][17][18][19] and combined experimental-theoretical investigations [20].…”

Section: Methodsmentioning

confidence: 99%

“…In our simulations the three-dimensional Wentzel-Kramers-Brillouin (3D-WKB) electron tunneling theory with arbitrary tip orientations is employed, see Appendix, which is implemented in the 3D-WKB-STM code [10,13,14]. Recently, the 3D-WKB method was successfully applied in a number of theoretical [15][16][17][18][19] and combined experimental-theoretical investigations [20].…”

Section: Methodsmentioning

confidence: 99%

What is the orientation of the tip in a scanning tunneling microscope?

Mándi

Teobaldi

Palotás

2015

Progress in Surface Science

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We introduce a statistical correlation analysis method to obtain information on the local geometry and orientation of the tip used in scanning tunneling microscopy (STM) experiments based on large scale simulations. The key quantity is the relative brightness correlation of constant-current topographs between experimental and simulated data. This correlation can be analyzed statistically for a large number of modeled tip orientations and geometries. Assuming a stable tip during the STM scans and based on the correlation distribution, it is possible to determine the tip orientations that are most likely present in an STM experiment, and exclude other orientations. This is especially important for substrates such as highly oriented pyrolytic graphite (HOPG) since its STM contrast is strongly tip dependent, which makes interpretation and comparison of STM images very challenging. We illustrate the applicability of our method considering the HOPG surface in combination with tungsten tip models of two different apex geometries and 18144 different orientations. We calculate constant-current profiles along the $<1\bar{1}00>$ direction of the HOPG(0001) surface in the $|V|\le 1$ V bias voltage range, and compare them with experimental data. We find that a blunt tip model provides better correlation with the experiment for a wider range of tip orientations and bias voltages than a sharp tip model. Such a combination of experiments and large scale simulations opens up the way for obtaining more detailed information on the structure of the tip apex and more reliable interpretation of STM data in the view of local tip geometry effects.Comment: Progress in Surface Science, accepted for publication, 25 pages manuscript, 9 figures, abstract shortene

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Surface diffusion of Pb atoms on the Si(553)-Au surface in narrow quasi-one-dimensional channels

Cited by 15 publications

References 43 publications

Silicene Nanoribbons on Pb-Reconstructed Si(111) Surface

Silicene Nanoribbons on Pb-Reconstructed Si(111) Surface

Structural model of silicene-like nanoribbons on a Pb-reconstructed Si(111) surface

What is the orientation of the tip in a scanning tunneling microscope?

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