Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 99: Poster Session: Transport
TT 99.27: Poster
Donnerstag, 15. März 2018, 15:00–19:00, Poster B
Probe independent mapping of electrostatic surface properties — Christian Wagner1,2, •Niklas Friedrich1,2,3, Pawel Chmielniak4,5,2, Jeff Rawson4,5,2, Taner Esat1,2, Michael Maiworm6, Ruslan Temirov1,2, and F. Stefan Tautz1,2 — 1Peter Grünberg Institut (PGI-3), Forschungszentrum Jülich, Germany — 2Jülich Aachen Reserach Alliance (JARA) - Fundamentals of Future Information Technology, Jülich, Germany — 3CIC nanoGune, Donostia-San Sebastian, Spain — 4Institute of Inorganic Chemestry, RWTH Aachen University, Germany — 5Peter Grünberg Institut (PGI-6), Forschungszentrum Jülich, Germany — 6Institut for Automation Engineering (IFAT), Otto-von-Guericke University Magdeburg, Germany
Mapping electrostatic surface properties with high spacial resolution, as well as high precision in the energy resolution is a desired goal in today’s surface and interface physics. However, for many scanning probe techniques it remains unclear to which extend the probing mechanism itself influences the measurement. Here we demonstrate that scanning quantum dot microscopy (SQDM) [1,2] is a technique suited to overcome this problem. Using this technique we investigate a single PTCDA molecule on Ag(111). Independent of the tip-sample distance we measure its surface dipole moment to |p| = -624 ± 38 mD. Furthermore, we show that the imaging process does not depend on the LUMO energy of the molecule used as the quantum dot during SQDM imaging.
C. Wagner et al. Phys. Rev. Lett. 115, 026101 (2015)
M. Green et al. Japan. J. Appl. Phys. 55, 08NA04-7 (2016)