Berlin 2024 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 9: Semiconductor Substrates I: Adsorption of Small Molecules, Metallic Nanowires, Overlayers

O 9.6: Vortrag

Montag, 18. März 2024, 11:45–12:00, MA 144

Diffusive mass transport of Pb on Si(111) (7x7) — •Felix Hartmann¹, Paul P. Schmidt¹, Regina Hoffmann-Vogel¹, Ralf Metzler^1,3, and Janet Anders^1,2 — ¹Institute of Physics and Astronomy, University of Potsdam, 14467 Potsdam, Germany — ²Department of Physics and Astronomy, University of Exeter, Stocker Road, Exeter EX4 4QL, UK — ³Asia Pacific Center for Theoretical Physics, Pohang 37673, Republic of Korea

Pb on Si(111)-(7x7) has been subject of numerous studies due to its strong quantum size effect, which explains the height selection and the characteristic shape of coarsened islands [1]. Previous experiments have shown the fast nucleation and “explosive” growth of the Pb islands, which happens on a timescales much faster than explained by classical nucleation theory [2,3]. In this talk we focus on numerically modelling the mass transport onto a growing island, as a first step to find an explanation for the “explosive” island growth. Our simulations are motivated by a recent experiment, which locally triggers stable Pb islands to grow in height. We show that certain surface processes in the Pb/Si(111)-(7x7) are well-described and explained by classical diffusion models.

[1] Z. Kuntová et. al. Phys. Rev. B, 78 (2008)

[2] H. Hattab et. al. Surf. Sci. 646 (2016)

[3] M. Hershberger et. al. Phys. Rev. Lett., 113 (2014)

Keywords: Pb/Si(111); Diffusion