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The importance of current density ‘focusing’ in STM image resolution
Author(s) -
Aers G. C.,
Leavens C. R.
Publication year - 1988
Publication title -
journal of microscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.569
H-Index - 111
eISSN - 1365-2818
pISSN - 0022-2720
DOI - 10.1111/j.1365-2818.1988.tb01362.x
Subject(s) - graphite , monolayer , hamiltonian (control theory) , resolution (logic) , current (fluid) , condensed matter physics , current density , chemistry , molecular physics , physics , materials science , nanotechnology , quantum mechanics , thermodynamics , mathematics , mathematical optimization , organic chemistry , artificial intelligence , computer science
SUMMARY In a previous paper we incorporated Tersoff and Hamann's model of an STM tip into Lang's transfer Hamiltonian result for the tunnelling current density and applied the resulting simple expression to Tersoff's six‐plane‐wave model of a monolayer of graphite. In this paper the results for a more realistic model of a graphite surface and a more complete selection of tip positions are presented. They support the previous conclusions that the normal component of the current density takes on both positive and negative values in a complex flow pattern and that its lateral falloff away from the (projected) tip position is much slower than expected from the extraordinary lateral resolution (∼1 Å) evident in the best STM images of graphite. This shows that sharp ‘focusing’ of the current density directly under the tip is not a necessary condition for high lateral resolution.