SKM 2023 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 46: Electron-Driven Processes at Surfaces and Interfaces

O 46.4: Vortrag

Mittwoch, 29. März 2023, 11:15–11:30, CHE 91

Quantum transport on anisotropic surfaces revealed by MONA — •Manuel Seitz¹, Andreas Christ¹, Markus Leisegang¹, Jacek Waluk², and Matthias Bode¹ — ¹Physikalisches Institut, Experimentelle Physik II, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany — ²Institute of Physical Chemistry, Polish Academy of Sciences, ul. Kasprzaka 44/52, 01-224 Warsaw, Poland

The ability to detect how charge carriers propagate in well-defined bands is of great importance for the exploitation of novel materials, e.g., in the context of spintronics or topological insulators. We developed the molecular nanoprobe (MONA) technique [1] to investigate the details of quantum transport. It utilizes a single molecule to detect ballistic charge carriers injected by the tip of a scanning tunneling microscope (STM). In this study, we investigate charge carrier transport in the structurally anisotropic Cu(110) surface which exhibits a surface state at the Y-point of the surface Brillouin zone [2]. We performed directional-, distance-, and energy-dependent measurements that reveal an unexpectedly rich anisotropic behavior. The results can be explained by the combined influence of the band structure-dependent transport path and the molecular excitation.
[1] Leisegang, M. et. al., Nano Lett. 18, 2165 (2018).
[2] Jiang, J., et. al., Phys. Rev. B 89, 085404 (2014).