Berlin 2012 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 13: Transport: Poster Session

TT 13.33: Poster

Monday, March 26, 2012, 15:00–19:00, Poster B

The role of the tip symmetry on the STM topography of π-conjugated molecules — •Benjamin Siegert, Sandra Sobczyk, Andrea Donarini, and Milena Grifoni — Institute of Theoretical Physics, University of Regensburg, Germany

Motivated by recent STM experiments, where either Cu tips or CO-functionalized tips have been adopted [1], we compare theoretically the influence of s-, p- and d-wave tip states on the current maps of π-conjugated molecules. Our theory is based on the density matrix formalism and it is sufficiently general to be applied to any STM device consisting of a π-conjugated molecule weakly coupled to the substrate and the tip. Here we concentrate on the study of the topography of benzene, pentacene and hydrogen phthalocyanine. Our formalism is able to mirror experimental results quite well showing that the shape of the recorded images is strongly related to the orbital structure of the tip.
L. Gross, et al., Phys. Rev. Lett. 107, 086101 (2011)