Simultaneous current-, force- and work function measurement with atomic resolution
M. Herz, Ch. Schiller, F. J. Giessibl, J. Mannhart
Abstract
The local work function of a surface determines the spatial decay of the charge density at the Fermi level normal to the surface. Here, we present a method that enables simultaneous measurements of local work function and tip-sample forces. A combined dynamic scanning tunneling microscope and atomic force microscope is used to measure the tunneling current between an oscillating tip and the sample in real time as a function of the cantilever's deflection. Atomically resolved work function measurements on a silicon (111)-(7× 7) surface are presented and related to concurrently recorded tunneling current- and force- measurements.
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