Regensburg 2022 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 22: Poster Monday: Surface Structure, Epitaxy, Growth and Tribology

O 22.5: Poster

Montag, 5. September 2022, 18:00–20:00, P4

Preparation of highly pure Cu(110) surfaces — •Manuel Seitz, Andreas Christ, Markus Leisegang, and Matthias Bode — Physikalisches Institut, Experimentelle Physik II, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany

Ballistic transport of hot charge carriers on the nanoscale becomes more and more important for the development of microelectronic components [1]. The molecular nanoprobe (MONA) technique [2] is a novel method to investigate ballistic charge transport which has already been applied to detect anisotropic transport on the Pd(110) surface [3]. For a more detailed understanding, a survey of other anisotropic fcc(110) surfaces, e.g. Cu(110), is aspired. To detect characteristics intrinsic to the Cu(110) surface, a highly clean and defect-free area of the surface is needed. However, cleaning (110) surfaces with such high purity has proven to be challenging. In this presentation, we summarize our experiences with the preparation of Cu(110) which are compared to similar experiments on Cu(111). While optimizing the preparation parameters, i.e., sputter and anneal cycles, we found a high mobility of surface atoms at room temperature on the Cu(110) surface. Furthermore, upon sputtering the Cu(111) surface, island formation is observed besides the expected vacancy islands [4].
[1] V. Sverdlov, et. al., Sci. Eng. Rep. 58, 228 (2008).
[2] M. Leisegang, et. al., Nano Lett. 18, 2165 (2018).
[3] M. Leisegang, et. al., Phys. Rev. Lett. 126.14, 146601 (2021)
[4] T. Michely, et. al., Phys. Rev. B 50.15, 11156 (1994).