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 63.7: Poster
Dienstag, 21. März 2017, 18:30–20:30, P2-OG3
Imaging the local voltage landscape of a Bi2Te3 surface — •Mandana Soleimani Esfahani, Stephanie Hoepken, Sebastian Bauer, and Christian A. Bobisch — Faculty of Physics, Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, Lotharstraße 1-21, 47057 Duisburg, Germany.
Bi2Te3 is a prominent prototype system for the new material class of topological insulators (TI) [1]. Compared to other TI materials like Bi2Se3 the bulk conductivity in Bi2Te3 is lower and the electron transport through the surface state should be enhanced. For Bi2Se3 we have already shown that surface defects like step edges and grain boundaries have an impact on the local transport field [2]. Now, we study the local electron transport on a Bi2Te3 surface by scanning tunneling potentiometry (STP, [3]). During the STP measurement a lateral current flows along the Bi2Te3 surface, resulting in a lateral variation of the electrochemical potential. The latter is probed by a STM tip simultaneously mapping the potential as well as the topography of the Bi2Te3 surface with nanometer lateral resolution. This allows for a detailed study of the electron transport field on the surface of Bi2Te3 on the atomic scale.
[1] M. Z. Hasan, C. L. Kane, Rev. Mod. Phys. 82, 3045 (2010).
[2] S. Bauer, C. A. Bobisch, Nat. Com. 7, 11381 (2016).
[3] C. A. Bobisch and R. Möller, CHIMIA 66, 23-30 (2012).