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      Scanning-tunneling microscopy at small tip-to-surface distances

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      Author
      Ciraci, S.
      Batra I.P.
      Date
      1987
      Journal Title
      Physical Review B
      Print ISSN
      1631829
      Volume
      36
      Issue
      11
      Pages
      6194 - 6197
      Language
      English
      Type
      Article
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      Please cite this item using this persistent URL
      http://hdl.handle.net/11693/26286
      Abstract
      The scanning-tunneling microscopy (STM) of graphite at small tip-to-surface distances is investigated using the self-consistent-field pseudopotential method. We have calculated potential, charge density in the region between the tip and surface, and the force corrugation. Our results reveal that the tip at the close proximity to the surface disturbs the states near the Fermi level, and induces localized states. The STM images, which are usually related to the local density of states at the Fermi level of the clean surface, are affected by these localized states. The tunneling barrier is shown to collapse at small distances and a new mechanism for current is postulated. Some experimental evidence for this effect is presented. © 1987 The American Physical Society.
      Published as
      http://dx.doi.org/10.1103/PhysRevB.36.6194
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