Simulation of Long-Range Contrast Modulation in Scanning Tunneling Microscope Image of Perylene-3,4,9,10-Tetracarboxylic-Dianhydride Monolayer on Graphite
- 1 June 1998
- journal article
- Published by IOP Publishing in Japanese Journal of Applied Physics
- Vol. 37 (6S)
- https://doi.org/10.1143/jjap.37.3864
Abstract
In order to simulate the scanning tunneling microscope (STM) image of perylene-3,4,9,10-tetracarboxylic-dianhydride (PTCDA) on graphite, we calculated the partial electron density, which is proportional to the tunneling current, by the extended Hückel tight binding method. The typical STM images of PTCDA have two characteristic features: (i) long-range contrast modulation caused by point-on-line coincidence and (ii) contrast difference due to molecular orientation with respect to the graphite substrate. Using the present simulation, these features can be reproduced from the expected geometrical relationship between PTCDA and graphite.Keywords
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