Dresden 2014 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 27: Organic/bio Molecules on Metal Surfaces III
O 27.10: Vortrag
Dienstag, 1. April 2014, 12:45–13:00, TRE Phy
Stiffness and Electronic Properties of a Single-Molecule Wire — •Christian Lotze1, Martina Corso2, Jingcheng Li2, Gunnar Schulze1, Thomas Niehaus3, Alessandro Pecchia4, Katharina J. Franke1, and Nacho Pascual2,5 — 1Freie Universität Berlin — 2CIC nanoGune, Donostia-San Sebastian, Spain — 3Universität Regensburg — 4CNR-ISMN, Rome, Italy — 5IKERBASQUE, Bilbao, Spain
Understanding and controlling charge transport properties in single-molecule devices is of great interest, for example to realize future molecular electronic circuits. These properties may change under external stimuli, e.g. light irradiation, electric field or mechanical stress [1]. In our experiments we measure the stiffness and electronic properties of a wire consisting of a single molecule by means of combined Scanning Tunneling and Atomic Force Microscopy (STM/AFM) [2]. With our STM tip we contact a functionalized polyphenyl molecule in one side and lift it up from the surface, while the other side remains attached to the substrate [3]. During lift up we observe characteristic features in the molecule’s conductance and find these correlated with plastic changes of the molecular junction. In agreement with DFT simulations we identify the creation of bonds as their origin and can draw a detailed picture of the lifting process of a single-molecule wire. [1] Briechle et al., Beilstein J. Nanotechnol. 2012, 3, 798 [2] Giessibl, Reviews of Modern Physics, 75, 949 (2003) [3] F. Pump et al., Appl. Phys. A 93, 335 (2008)