Dresden 2017 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 63: Focus Session: Charge Transport at Surfaces and Nanostructures with Multi-probe Techniques

O 63.10: Poster

Dienstag, 21. März 2017, 18:30–20:30, P2-OG3

Scanning tunneling potentiometry using a triangular geometry of the electric contacts — •Hüseyin Azazoglu, Sebastian Bauer, Rolf Möller, and Christian A. Bobisch — Faculty of Physics and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, Lotharstr. 1, 47057 Duisburg, Germany

Scanning tunneling potentiometry (STP) [1] is used to study the microscopic resistivity in an electric conductor. The direction of the electric current is varied on the nanometer scale by applying three point contacts in an equilateral triangle using different relative voltages at the tips. Thereby, we can rotate the global current direction by any angle up to 360^∘ during the STP measurements. The Si(111)-√3×√3:Ag surface reconstruction [2] was studied. We find that the measured local potential varies as a function of the global current direction. This demonstrates the ability to manipulate the electric transport on the nanoscale with the help of the three-point-geometry, e.g., this technique can be used to study scattering at an individual defect as a function of the angle of incidence.

[1] P. Muralt et. al., Appl. Phys. Lett. 48, p. 514, (1986). [2] J. Homoth et al, Nano Letters 9,1589, (2009).