Regensburg 2016 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 47: Electronic Structure of Surfaces: Spectroscopy, Surface States

O 47.1: Poster

Dienstag, 8. März 2016, 18:15–20:30, Poster E

Step and terrace conductivity of Ag/Si(111)-(√3×√3) and Si(111)-(7×7) measured by scanning tunneling potentiometry — •Felix Lüpke, Stefan Korte, Vasily Cherepanov, and Bert Voigtländer — Peter Grünberg Institut (PGI-3), Forschungszentrum Jülich, 52425 Jülich, Germany, and JARA-Fundamentals of Future Information Technology

We investigate the local electric potential of Ag(√3×√3) and (7×7) reconstructed Si(111) surfaces by means of scanning tunneling potentiometry: Two tips of a multi-tip scanning tunneling microscope inject a lateral current into the sample under investigation while a third tip is scanned across the sample surface measuring the topography and local potential simultaneously. From the measured sample geometry and potential distribution on its surface we extract surface and step conductivities.