Dresden 2017 – scientific programme

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O: Fachverband Oberflächenphysik

O 40: Focus Session: Charge Transport at Surfaces and Nanostructures with Multi-probe Techniques II

O 40.4: Talk

Tuesday, March 21, 2017, 15:00–15:15, WIL C307

Two-probe measurements on the atomic scale wires: ballistic transport through surface states of Ge(001) — •Marek Kolmer¹, Piotr Olszowski¹, Rafal Zuzak¹, Szymon Godlewski¹, Christian Joachim^2,3, and Marek Szymonski¹ — ¹Centre for Nanometer-Scale Science and Advanced Materials, NANOSAM, Faculty of Physics, Astronomy and Applied Computer Science, Jagiellonian University, Lojasiewicza 11, 30-348 Krakow, Poland — ²Nanoscience Group & MANA Satellite, CEMES/CNRS, 29 rue Marvig, BP 94347, 31055 Toulouse, France — ³International Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan

We will present our recent results obtained on the new Scienta-Omicron low temperature ultra-high vacuum 4-probe STM (LT-Nanoprobe). Firstly, we will show our methodology for fine relative positioning of two STM probes on Ge(001) and Ge(001):H surfaces with unprecedented atomic precision and with a lateral exact probe to probe distance below 50 nm. Moreover, we will discuss our design of the 2-probe experiment, which allows a direct testing of the electronic transport through atomic-scale structures in a fully planar geometry. That will be shown on an example of a model system: bare Ge dimer wire supported on Ge(001) and Ge(001):H surface. In this case we determine ballistic transport regimes in the atomic wire by systematic 2-probe experiments on the probe to probe distances below 50 nm.