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Tantalum induced butterfly-like clusters on Si (111)-7×7 surface: STM/STS study at low coverage

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Title: Tantalum induced butterfly-like clusters on Si (111)-7×7 surface: STM/STS study at low coverage
Authors: Shukrynau, Pavel1,2 pavel.shukrynau@physik.tu-chemnitz.de, Mutombo, Pingo1, Švec, Martin1, Hietschold, Michael2, Cháb, Vladimír1
Source: Surface Science. Feb2012, Vol. 606 Issue 3/4, p356-361. 6p.
Subjects: Tantalum, Cluster analysis (Statistics), Annealing of metals, Covalent bonds, Band gaps, Molecular structure, Electronic structure
Abstract: Abstract: The adsorption of the small amounts of tantalum on Si (111)-7×7 reconstructed surface is investigated systematically using scanning tunneling microscopy and tunneling spectroscopy combined with first-principles density functional theory calculations. We find out that the moderate annealing of the Ta covered surface results in the formation of clusters of the butterfly-like shape. The clusters are sporadically distributed over the surface and their density is metal coverage dependent. Filled and empty state STM images of the clusters differ strongly suggesting the existence of covalent bonds within the cluster. Tunneling spectroscopy measurements reveal small energy gap, showing semiconductor-like behavior of the constituent atoms. The cluster model based on experimental images and theoretical calculations has been proposed and discussed. Presented results show that Ta joins the family of adsorbates, that are known to form magic clusters on Si (111)-7×7, but its magic cluster has the structural and electronic properties that are different from those reported before. [Copyright &y& Elsevier]
Copyright of Surface Science is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 70259932
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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  Data: Tantalum induced butterfly-like clusters on Si (111)-7×7 surface: STM/STS study at low coverage
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  Data: <searchLink fieldCode="AR" term="%22Shukrynau%2C+Pavel%22">Shukrynau, Pavel</searchLink><relatesTo>1,2</relatesTo><i> pavel.shukrynau@physik.tu-chemnitz.de</i><br /><searchLink fieldCode="AR" term="%22Mutombo%2C+Pingo%22">Mutombo, Pingo</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Švec%2C+Martin%22">Švec, Martin</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Hietschold%2C+Michael%22">Hietschold, Michael</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Cháb%2C+Vladimír%22">Cháb, Vladimír</searchLink><relatesTo>1</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Surface+Science%22">Surface Science</searchLink>. Feb2012, Vol. 606 Issue 3/4, p356-361. 6p.
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  Data: <searchLink fieldCode="DE" term="%22Tantalum%22">Tantalum</searchLink><br /><searchLink fieldCode="DE" term="%22Cluster+analysis+%28Statistics%29%22">Cluster analysis (Statistics)</searchLink><br /><searchLink fieldCode="DE" term="%22Annealing+of+metals%22">Annealing of metals</searchLink><br /><searchLink fieldCode="DE" term="%22Covalent+bonds%22">Covalent bonds</searchLink><br /><searchLink fieldCode="DE" term="%22Band+gaps%22">Band gaps</searchLink><br /><searchLink fieldCode="DE" term="%22Molecular+structure%22">Molecular structure</searchLink><br /><searchLink fieldCode="DE" term="%22Electronic+structure%22">Electronic structure</searchLink>
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  Label: Abstract
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  Data: Abstract: The adsorption of the small amounts of tantalum on Si (111)-7×7 reconstructed surface is investigated systematically using scanning tunneling microscopy and tunneling spectroscopy combined with first-principles density functional theory calculations. We find out that the moderate annealing of the Ta covered surface results in the formation of clusters of the butterfly-like shape. The clusters are sporadically distributed over the surface and their density is metal coverage dependent. Filled and empty state STM images of the clusters differ strongly suggesting the existence of covalent bonds within the cluster. Tunneling spectroscopy measurements reveal small energy gap, showing semiconductor-like behavior of the constituent atoms. The cluster model based on experimental images and theoretical calculations has been proposed and discussed. Presented results show that Ta joins the family of adsorbates, that are known to form magic clusters on Si (111)-7×7, but its magic cluster has the structural and electronic properties that are different from those reported before. [Copyright &y& Elsevier]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Surface Science is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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      – Type: doi
        Value: 10.1016/j.susc.2011.10.017
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      – Code: eng
        Text: English
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        PageCount: 6
        StartPage: 356
    Subjects:
      – SubjectFull: Tantalum
        Type: general
      – SubjectFull: Cluster analysis (Statistics)
        Type: general
      – SubjectFull: Annealing of metals
        Type: general
      – SubjectFull: Covalent bonds
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      – SubjectFull: Band gaps
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      – SubjectFull: Molecular structure
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      – SubjectFull: Electronic structure
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      – TitleFull: Tantalum induced butterfly-like clusters on Si (111)-7×7 surface: STM/STS study at low coverage
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              Text: Feb2012
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              Y: 2012
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