Regensburg 2016 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 7: Graphene I: Structure and Dynamics
O 7.11: Vortrag
Montag, 7. März 2016, 13:15–13:30, H24
Controling intramolecular Hydrogen-transfer by Gate-tunable STM — •Shai Mangel1, Christian Dette1, Katharina Polyudov1, Paul Punke1, Roberto Urcuyo1, Marko Burghard1, Soon Jung Jung1, and Klaus Kern1,2 — 1Max-Planck-Institute for Solid State Research, D-70569 Stuttgart — 2École Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland
The atomic level control of the electron transport has important advantages for many applications, such as molecular electronics, solar cells and sensors. Electron transport properties can be controlled by the intramolecular reaction which reshape the electronic configuration without any significant change in the conformation. The STM-induced tautomerization, i.e the interconversion between two isomers due to the migration of Hydrogen, was observed in the form of telegraphic noise. Several methods to control the intramolecular Hydrogen-transfer by changing the chemical environment of the molecule have been developed, such as locating adatoms or introducing defects. However, these affect the molecules only in the nm range. In this work, using the gate-tunable STM, we demonstrate a global control of the chemical environment of the substrate which results in the changing of the switching rate of the Hydrogen-transfer. The system we have used is a molecular network of phthalocyanine on graphene. Understanding and controlling the influence of the field-effect on the molecules, will be crucial for the construction of future molecular devices for energy and information usages.