Abstract
A transition metal tip consisting of a single tungsten atom adsorbed on a W(110) surface is modelled. Chemisorpion theory is applied to treat the interaction of the tip atom with the flat W(110)-surface. The basis set on the tip atom includes 6s-, 6p- and 5d-orbitals. The importance of the d-electrons for the tunneling to an Al(111)-surface is investigated. Inclusion of the d- orbitals affects strongly the local electronic structure and modifies the current. For short distances a significant part of the total tunnel current flows directly via the tip d-orbitals. The theory is used to investigate the ‘barrier height’ of the clean surface. A corrugation of the Al(111)-surface is obtained in STM-theory, if a elastic deformation of the tip is taken into account.
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Doyen, G., Koetter, E., Barth, J., Drakova, D. (1990). Theory of tunneling from transition metal tips. In: Behm, R.J., Garcia, N., Rohrer, H. (eds) Scanning Tunneling Microscopy and Related Methods. NATO ASI Series, vol 184. Springer, Dordrecht. https://doi.org/10.1007/978-94-015-7871-4_5
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DOI: https://doi.org/10.1007/978-94-015-7871-4_5
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