Landolt-Börnstein - Group III Condensed Matter Interpretation of STM images


This chapter talks about interpretation of scanning tunneling microscopy (STM) images. The theory of tunneling between two planar electrodes has been extensively developed and often serves as the basis for interpretation of STM results. In particular, Tersoff and Hamann have modified the planar-tunneling model of Bardeen to a geometry more appropriate to the STM; the resulting theory has provided significant insight into the influence of the properties of the tip on the resulting STM images. In addition, it provides a fundamental understanding of the resolution of the STM. Geometry utilized in the Tersoff-Hamann theory of the scanning tunneling microscope is shown. The Tersoff-Hamann theory considers a geometry, in which the sample is periodic, but the tip consists of a sphere of radius R, located at some arbitrary position above the sample (denoted by r0). For metals, the delocalized nature of the electronic states suggests that in many instances the Fermi-level density of states might be approximated by the total charge density, thereby resulting in a close correspondence between the features observed in STM and the atomic positions.

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Title Interpretation of STM images
Book Title
Interaction of Radiation with Surfaces and Electron Tunneling
9.2.1 Introduction
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Landolt-Börnstein - Group III Condensed Matter
  • G. Chiarotti
  • Authors
  • R. J. Hamers
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