Regensburg 2025 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 69: Nanostructures at Surfaces II

O 69.2: Vortrag

Mittwoch, 19. März 2025, 15:15–15:30, H25

Examination and Modification of Self-organized Nanostructures in the Ternary System Au/Co/Ge(001): Chain Growth and the Observation of a Zero-Bias Anomaly — •Nico Kubetschek, Till-Jakob Stehling, Ulrike Kürpick, Marcel Schlesag, Johann Tonhäuser, and René Matzdorf — Institute of Physics, University of Kassel, Heinrich-Plett-Str. 40, Kassel D-34132, Germany

The twofold symmetric reconstruction of the Ge(001) surface provides a template for the self-organized formation of various transition metal nanostructures [1]. We employed scanning tunnelling microscopy (STM) and spectroscopy (STS) at 77 K and 5 K to examine the nucleation, chain growth, and subsequent modification of hexagonal cobalt nanostructures embedded in Ge(001) [2] through the introduction of gold-induced defects [3]. Moreover, the introduction of additional amounts of Au resulted in the formation of previously unobserved nanorods [4]. The electronic properties of these rods were examined by STS, which revealed a zero-bias anomaly (ZBA) in the tunneling spectra. The formation of nanorods with high aspect ratios was subjected to a systematic statistical investigation.

[1] J. Schäfer et al. 2009, New J. Phys. 11 125011, [2] H. J.W. Zandvliet et al. 2011, Surface Science 605,1129, [3] J. Tonhäuser et al. 2022 Phys. Rev. B 106, 115404, [4] M. Schlesag et al. 2024 Phys. Rev. B 110, 195412

Keywords: Density of states; 1-dimensional systems; Nanorods; Scanning tunneling microscopy; Scanning tunneling spectroscopy