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The puzzle of contrast inversion in DNA STM imaging (invited talk)
J. Yi, E. Shapir, H. Cohen, A. Kotlyar, D. Porath, and G. Cuniberti
From Solid State To BioPhysics II: Role of Inhomogeneities in Solid, Soft and Bio-Matter
2004.06.26-02(07); Cavtat, Dubrovnik, Croatia
| STM images of DNA molecules on gold substrate display
contrast inversions both while adjusting
current-setting and spontaneously. Such a feature turns
out to be associated with long-range characteristics in
the tunneling-distance spectroscopy that is not
explainable within the WKB formulation, the widely used
semiclassical theory for fitting STM images. Here we
render a picture, compatible with the experimental
observations, by suggesting a model for resonant
tunneling through structured vacuum levels formed by
the DNA as a macro-charged-polyelectrolyte.
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Prof. Dr. Gianaurelio Cuniberti
secretariat:
postal address:
Institute for Materials Science
TU Dresden
01062 Dresden, Germany
visitors and courier address:
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