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Regensburg 2019 – scientific programme

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O: Fachverband Oberflächenphysik

O 72: Poster Wednesday: Scanning Probe Techniques

O 72.6: Poster

Wednesday, April 3, 2019, 17:45–20:00, Poster B2

Apparent tunneling barrier height and local work function of atomic arraysNeda 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.

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