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O: Fachverband Oberflächenphysik
O 72: Poster Wednesday: Scanning Probe Techniques
O 72.6: Poster
Mittwoch, 3. April 2019, 17:45–20:00, Poster B2
Apparent tunneling barrier height and local work function of atomic arrays — Neda Noei, Alexander Weismann, and •Richard Berndt — IEAP, CAU Kiel, D-24098 Kiel
Spatially resolved measurements of the apparent tunneling barrier height Φapp in scanning tunneling microscopy have been used to estimate variations of the local work function Φ of surface structures. We experimentally show that Φapp can fail as a measure of Φ. The discrepancies are attributed to a kinetic energy contribution to Φapp. This contribution depends on the lateral extent of the tunneling current filament and, consequently, on the local surface structure. Support by DFG via SFB 677 is acknowledged.