Local electric field effects in STM of single-atom adsorption on a Si(001) surface

Anna Pomyalov; Yishay Manassen

doi:10.1016/S0039-6028(97)00162-3

Local electric field effects in STM of single-atom adsorption on a Si(001) surface

Anna Pomyalov, Yishay Manassen

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1 Scopus citations

Abstract

The effect of the tip-induced electric field on STM images and spectra from a Si(001) surface on which Sb, Na and K atoms were adsorbed at low coverage was studied by total-energy LDF calculations. The adsorption geometry of Na and K atoms on the Si(001) surface was found to be strongly field-dependent. In contrast, the adsorption geometry of Sb on the Si(001) surface was almost insensitive to the field. The different topographic and electronic responses of different atoms in the surface resulted in changes in the relative contrast of the adsorbed atoms and the substrate in STM images. The calculated filled-state images were found to be similar to reported experimental images [Y.W. Mo, Phys. Rev. Lett. 65 (1990) 3417; A. Brodde, Th. Bertrams, H. Neddermeyer, Phys. Rev. B 47 (1993) 4508]. We found that the electric field inhibits empty-states imaging of alkali metals on Si(001) surface, Possible distortions of the tunneling spectra are discussed. Our results demonstrate that the tip-induced electric field is an important factor in forming STM data, and cannot be neglected in the interpretation of STM images and spectra.

Original language	English
Pages (from-to)	275-287
Number of pages	13
Journal	Surface Science
Volume	382
Issue number	1-3
DOIs	https://doi.org/10.1016/S0039-6028(97)00162-3
State	Published - 20 Jun 1997
Externally published	Yes

Keywords

Alkali metals
Antimony
Chemisorption
Density functional methods
Silicon
Surface relaxation and reconstruction

ASJC Scopus subject areas

Condensed Matter Physics
Surfaces and Interfaces
Surfaces, Coatings and Films
Materials Chemistry

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10.1016/S0039-6028(97)00162-3

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title = "Local electric field effects in STM of single-atom adsorption on a Si(001) surface",

abstract = "The effect of the tip-induced electric field on STM images and spectra from a Si(001) surface on which Sb, Na and K atoms were adsorbed at low coverage was studied by total-energy LDF calculations. The adsorption geometry of Na and K atoms on the Si(001) surface was found to be strongly field-dependent. In contrast, the adsorption geometry of Sb on the Si(001) surface was almost insensitive to the field. The different topographic and electronic responses of different atoms in the surface resulted in changes in the relative contrast of the adsorbed atoms and the substrate in STM images. The calculated filled-state images were found to be similar to reported experimental images [Y.W. Mo, Phys. Rev. Lett. 65 (1990) 3417; A. Brodde, Th. Bertrams, H. Neddermeyer, Phys. Rev. B 47 (1993) 4508]. We found that the electric field inhibits empty-states imaging of alkali metals on Si(001) surface, Possible distortions of the tunneling spectra are discussed. Our results demonstrate that the tip-induced electric field is an important factor in forming STM data, and cannot be neglected in the interpretation of STM images and spectra.",

keywords = "Alkali metals, Antimony, Chemisorption, Density functional methods, Silicon, Surface relaxation and reconstruction",

author = "Anna Pomyalov and Yishay Manassen",

note = "Funding Information: We are grateful to Professor H. Neddermeyer for providing us with the original prints of the K/Si(001) images. This work was supported by the Minerva Foundation, Munich, Germany, by a grant from the Basic Investigation Foundation administered by the Israeli Academy of Sciences and Humanities, and by the Edith Reich Fund. Y.M. is an incumbent of the Lilian and George Lyttle Career Development Chair.",

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T1 - Local electric field effects in STM of single-atom adsorption on a Si(001) surface

AU - Pomyalov, Anna

AU - Manassen, Yishay

N1 - Funding Information: We are grateful to Professor H. Neddermeyer for providing us with the original prints of the K/Si(001) images. This work was supported by the Minerva Foundation, Munich, Germany, by a grant from the Basic Investigation Foundation administered by the Israeli Academy of Sciences and Humanities, and by the Edith Reich Fund. Y.M. is an incumbent of the Lilian and George Lyttle Career Development Chair.

PY - 1997/6/20

Y1 - 1997/6/20

N2 - The effect of the tip-induced electric field on STM images and spectra from a Si(001) surface on which Sb, Na and K atoms were adsorbed at low coverage was studied by total-energy LDF calculations. The adsorption geometry of Na and K atoms on the Si(001) surface was found to be strongly field-dependent. In contrast, the adsorption geometry of Sb on the Si(001) surface was almost insensitive to the field. The different topographic and electronic responses of different atoms in the surface resulted in changes in the relative contrast of the adsorbed atoms and the substrate in STM images. The calculated filled-state images were found to be similar to reported experimental images [Y.W. Mo, Phys. Rev. Lett. 65 (1990) 3417; A. Brodde, Th. Bertrams, H. Neddermeyer, Phys. Rev. B 47 (1993) 4508]. We found that the electric field inhibits empty-states imaging of alkali metals on Si(001) surface, Possible distortions of the tunneling spectra are discussed. Our results demonstrate that the tip-induced electric field is an important factor in forming STM data, and cannot be neglected in the interpretation of STM images and spectra.

AB - The effect of the tip-induced electric field on STM images and spectra from a Si(001) surface on which Sb, Na and K atoms were adsorbed at low coverage was studied by total-energy LDF calculations. The adsorption geometry of Na and K atoms on the Si(001) surface was found to be strongly field-dependent. In contrast, the adsorption geometry of Sb on the Si(001) surface was almost insensitive to the field. The different topographic and electronic responses of different atoms in the surface resulted in changes in the relative contrast of the adsorbed atoms and the substrate in STM images. The calculated filled-state images were found to be similar to reported experimental images [Y.W. Mo, Phys. Rev. Lett. 65 (1990) 3417; A. Brodde, Th. Bertrams, H. Neddermeyer, Phys. Rev. B 47 (1993) 4508]. We found that the electric field inhibits empty-states imaging of alkali metals on Si(001) surface, Possible distortions of the tunneling spectra are discussed. Our results demonstrate that the tip-induced electric field is an important factor in forming STM data, and cannot be neglected in the interpretation of STM images and spectra.

KW - Alkali metals

KW - Antimony

KW - Chemisorption

KW - Density functional methods

KW - Silicon

KW - Surface relaxation and reconstruction

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VL - 382

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JO - Surface Science

JF - Surface Science

IS - 1-3

ER -

Local electric field effects in STM of single-atom adsorption on a Si(001) surface

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