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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 30: Transport: Molecular Electronics and Photonics (jointly with CPP, HL, MA, O)
CPP 30.3: Vortrag
Mittwoch, 22. März 2017, 10:00–10:15, HSZ 201
Visualizing the role of molecular orbitals in charge transport through individual diarylethene Isomers — •Gaël Reecht1, Christian Lotze1, Dmytro Sysoiev2, Thomas Huhn2, and Katharina J. Franke1 — 1Freie Universität Berlin , Berlin ,Germany — 2Universität Konstanz, Konstanz, Germany.
Diarylethene molecules are prototype molecular switches with their two isomeric forms exhibiting strikingly different conductance, while maintaining similar length. With a scanning tunneling microscope (STM) we investigate the electronic structure and the transport properties of the open and closed isomers of a sulfur-free diarylethene. The electronic structure is determined with scanning tunneling spectroscopy (STS) for the molecule lying on the surface. Between the two isomers, intriguing differences of the energy and the spatial extend of the molecule orbitals are observed. We then lift the two isomers with the tip of the STM and measure the current passing through the individual molecules. We observe an important difference of conductance between the two forms. With a simple analytical model of transport based on the results of the STS measurements, we show that the previously determined orbital characteristics are essential ingredients for the complete understanding of the transport properties.