Regensburg 2019 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 28: Organic Molecules on Inorganic Substrates I: Switching and Manipulation
O 28.6: Vortrag
Dienstag, 2. April 2019, 11:45–12:00, H24
Discriminating and counting the possible molecular conformations in a prototypical molecular wire junction — •Marvin Knol1,2, Alexander Diener1,2, Philipp Leinen1,2, F. Stefan Tautz1,2, and Christian Wagner1,2 — 1Peter Grünberg Institut (PGI-3), Forschungszentrum Jülich, Germany — 2JARA-Fundamentals of Future Information Technology
Mechanical manipulation of molecules with a scanning probe microscope (SPM) is a versatile technique to study molecular properties and to create new single-molecular devices [1,2,3]. One example is the exciting research field of quantum transport through molecules, which is often hampered by the lack of precise control over the molecular junction conformation. Here we report molecular manipulation experiments in which a single PTCDA (perylene-tetracarboxylic dianhydride) molecule is suspended between two metal electrodes; a Ag(111) surface and a non-contact AFM/STM tip in a variety of discrete junction conformations. We record frequency shift and conductance fingerprints in a tip-space volume of only 0.1 A^3 and perform a statistical analysis thereof to discriminate and count the possible tip-molecule-surface conformations. Our work is a step towards the complete identification of the so-far unobservable atomic structure of molecular junctions and could be the key to fully reproducible quantum transport studies.
[1] C. Wagner et al. Phys. Rev. Lett. 115, 026101 (2015)
[2] T. Esat et al. Nature 558, 573 (2018)
[3] R. Temirov et al. Phys. Rev. Lett. 120, 206801 (2018)