Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 74: Molecular Electronics and Photonics
TT 74.8: Vortrag
Mittwoch, 14. März 2018, 18:00–18:15, H 3005
Quantum Transport Properties of Polymethine and Polyene Molecular Wires — •Daniel Hernangómez-Pérez1, Suman Gunasekaran2, Iryna Davydenko3, Seth Marder3, Ferdinand Evers1, and Latha Venkataraman2,4 — 1Institute of Theoretical Physics, University of Regensburg, D-93050 Regensburg, Germany — 2Department of Chemistry, Columbia University, New York, New York 10027, United States — 3School of Chemistry and Biochemistry and Center for Organic Photonics and Electronics, Georgia Institute of Technology, Atlanta, Georgia 30332-0400, United States — 4Department of Applied Physics and Applied Mathematics, Columbia University, New York, New York 10027, United States
We report recent results on quantum transport properties of polymethine and polyene molecular wires. These wires represent a class of linear conjugated molecules which can be understood in the context of the topological Su-Schrieffer-Heeger model. Here, we present conductance measurements in polymethine dye junctions obtained with the scanning tunneling microscope break junction technique. Supported by tight-binding and ab-initio calculations, we argue that the lack of exponential decay in the conductance trends with the system length is due to the small bond-length alternation present in the polymethine wires. We finally discuss conditions for the observation of topological modes in quantum transport experiments.