Berlin 2015 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 79: Scanning Probe Techniques: STM

O 79.6: Vortrag

Donnerstag, 19. März 2015, 12:00–12:15, HE 101

Scanning Tunneling Potentiometry: Magnetotransport on the Atomic Scale — Philip Willke, •Thomas Kotzott, Anna Sinterhauf, and Martin Wenderoth — IV. Physikalisches Institut, Georg-August-Universität Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen

The method of scanning tunneling potentiometry (STP) has been introduced by Muralt and Pohl [1] as a technique for mapping the electrochemical potential locally and has been developed continuously [2]. Here we present a new STP setup with a home-built low-temperature STM operating at 6K and applicable magnetic field of up to 6T. We study high-resolution STP of scattering centers on a sub-nanometer scale, especially the spatial evolution of the electrochemical potential for the graphene monolayer/bilayer junction. We perform magnetotransport STP measurements mapping the local electrochemical potential as a function of the applied magnetic field. This allows us to identify localized and delocalized contributions to the magnetoresistance in epitaxial-grown graphene. This work was supported by DFG priority program 1459 "Graphene".

[1] P. Muralt, D. W. Pohl, Appl. Phys. Lett. 48, 514 (1986)

[2] T. Druga, M. Wenderoth, J. Homoth, M. A. Schneider and R. G. Ulbrich, Rev. Sci. Instrum. 81, 083704 (2010)