Ou-Yang, Hui and Källebring, Bruno and Marcus, R. A. (1993) A theoretical model of scanning tunneling microscopy: Application to the graphite (0001) and Au(111) surfaces. Journal of Chemical Physics, 98 (9). pp. 7565-7573. ISSN 0021-9606. http://resolver.caltech.edu/CaltechAUTHORS:OUYjcp93b
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An expression for the scanning tunneling microscopy (STM) current between the tip and sample is presented using first-order perturbation theory for a two-Hamiltonian formalism ("reactants" and "products"). The calculated STM current depends on the square of the sample-tip matrix elements, averaged over a selection of random points in wave vector space. In the limit of low voltage and temperature, this averaging is over the Fermi surface of the sample. The model is applied to the graphite (0001) and Au(111) surfaces using a simple model (chain) of a tungsten tip and the tight-binding approximation. Comparisons with experiments and with the result for graphite obtained by Tersoff and Lang using a molybdenum tip are given. The theory is applied elsewhere to STM of adsorbates.
|Additional Information:||Copyright © 1993 American Institute of Physics. Received 27 November 1992; accepted 25 January 1993. It is a pleasure to acknowledge the support of this research by the Office of Naval Research, by the National Science Foundation, and by the Natural Science Research Council of Sweden. Arthur Amos Noyes Laboratory of Chemical Physics, Contribution No. 8772.|
|Subject Keywords:||SCANNING TUNNELING MICROSCOPY, GRAPHITE, SURFACES, GOLD, EQUATIONS, MATHEMATICAL MODELS, ELECTRIC CURRENTS, PERTURBATION THEORY, HAMILTONIANS, MATRIX ELEMENTS, TEMPERATURE DEPENDENCE, ELECTRIC POTENTIAL|
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|Deposited On:||21 Oct 2008 22:55|
|Last Modified:||26 Dec 2012 10:26|
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