Adsorption and electronic structures of Na adatoms on the Ag/Si(111)-
                
                  
                
                $\sqrt 3  \times \sqrt 3 $
               surface

Kim, Gyu Hyeong; Jeong, Sukmin

doi:10.3938/jkps.60.1390

Journal of the Korean Physical Society

2012

DOI: 10.3938/jkps.60.1390

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Adsorption and electronic structures of Na adatoms on the Ag/Si(111)- $\sqrt 3 \times \sqrt 3 $ surface

Gyu Hyeong Kim

Sukmin Jeong

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2015

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Cited by 2 publications

References 17 publications

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Change of Electronic Structures by Dopant-Induced Local Strain

Kim

Jeong

2015

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Ag-induced Si(111)- surfaces (-Ag) exhibit unusual electronic structures that cannot be explained by the conventional rigid band model and charge transfer model. The (-Ag surfaces feature a free-electron-like parabolic band, the S1 band, that selectively shifts downward upon the adsorption of noble metal or alkali metal adatoms. Furthermore, the downward shift of S1 is independent of the type of dopants, Au, Ag, and Na. According to charge transfer analysis, Au adatoms accumulate electrons from the substrate and become negatively charged, whereas Na adatoms become positively charged, which indicates that S1 should shift in the opposite direction for both the adatoms. Investigation of calculated structures, calculation of model structures, and tight-binding analysis disclose that the changes in the electronic structure are closely related to the average Ag-Ag distance in the substrate and have their origin in the local strain induced by dopants (adatoms). This explanation implies that the electronic structure is irrespective of the dopant characters itself and paves a new way for understanding the electronic structures associated with the presence of dopants.

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Change of Electronic Structures by Dopant-Induced Local Strain

Kim

Jeong

2015

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Electrical conductivity of reconstructed Si(111) surface with sodium-doped C60 layers

Tsukanov

Ryzhkova

Borisenko

et al. 2015

Applied Physics Letters

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Electrical conductance of sodium-doped C60 ultra-thin layers (1–6 monolayers) grown on the Na-adsorbed Si(111)√3 × √3-Au surface has been studied in situ by four-point probe technique, combined with low-energy electron diffraction observations. Evidence of conductance channel formation through the C60 ultrathin layer is demonstrated as a result of Na dosing of 3 and 6 monolayers thick C60 layers. The observed changes in surface conductivity can be attributed to the formation of fulleride-like NaC60 and Na2C60 compound layers.

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Adsorption and electronic structures of Na adatoms on the Ag/Si(111)- $\sqrt 3 \times \sqrt 3 $ surface

Cited by 2 publications

References 17 publications

Change of Electronic Structures by Dopant-Induced Local Strain

Change of Electronic Structures by Dopant-Induced Local Strain

Electrical conductivity of reconstructed Si(111) surface with sodium-doped C60 layers

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