Berlin 2018 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 67: Electronic structure of surfaces: Spectroscopy, surface states III
O 67.5: Vortrag
Mittwoch, 14. März 2018, 16:15–16:30, MA 042
Revealing the Wave Nature of Hot Electrons with a Molecular Nanoprobe — •Markus Leisegang1, Jens Kügel1, Lucas Klein1, and Matthias Bode1,2 — 1Physikalisches Institut, Experimentelle Physik II, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany — 2Wilhelm Conrad Röntgen Center of Complex Material Systems (RCCM), Universität Würzburg, Am Hubland, 97074 Würzburg
Electron transport in materials is usually determined by conductance measurements performed in between two contacts which are typically separated by a minimal distance of hundreds of nanometers. Future nanoscale applications like single-molecule logic gate structures [1], however, will require characterization of transport properties on much shorter length scales. Here we show how STM-induced molecular nano-probing (MONA) can be used for the characterization of quasiparticle transport on a length scale well below 10 nanometer [2]. We present results obtained on dehydrogenated H2Pc molecules. Isomerization was triggered by hot electrons injected from a STM tip into the Ag(111) substrate close to the molecule. By utilizing various atom-by-atom–engineered Ag nano structures we are able to determine how quasiparticles propagate and under which conditions interference of coherent quantum-mechanical wave functions are observed. We will show how these findings can be utilized to create an energy-selective filter for single-molecule switches.
[1] C. Li et. al., Nature Nano. 12, 1071-1076 (2017)
[2] J. Kügel et. al., Nano Lett. 17, 5106-5112 (2017)