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      Metallization of Silicon upon Potassium Adsorption

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      Author(s)
      Çıracı, Salim
      Batra, I. P.
      Date
      1987
      Source Title
      Physical Review Letters
      Print ISSN
      0031-9007
      Volume
      58
      Issue
      19
      Pages
      1982 - 1985
      Language
      English
      Type
      Article
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      Abstract
      We report novel features of potassium deposition on a Si(111)-(2×1) surface as a function of coverage. The binding is ionic even at the saturation coverage without any overlayer metallization. Up to a threshold coverage, the alkali-metal electrons are donated to the empty surface state resulting in a 1D metallic chain. Above this coverage, the conduction-band states are occupied, so that the surface electrons become itinerant leading to the metallization of the substrate and onset of enhanced conductivity. © 1987 The American Physical Society.
      Permalink
      http://hdl.handle.net/11693/26285
      Published Version (Please cite this version)
      http://dx.doi.org/10.1103/PhysRevLett.58.1982
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