Dresden 2017 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 48: Poster: Polymer Crystallization, Nucleation and Selfassembly

CPP 48.8: Poster

Mittwoch, 22. März 2017, 18:30–21:00, P2-OG1

Evidence for self-organized formation of logarithmic spirals during explosive crystallization of amorphous Ge:Mn layers — •Danilo Bürger1, Stefan Baunack2, Jürgen Thomas3, Steffen Oswald3, Horst Wendrock3, Lars Rebohle4, Thomas Schumann4, Wolfgang Skorupa4, Daniel Blaschke4, Thomas Gemming3, Oliver G. Schmidt1,2, and Heidemarie Schmidt11Material Systems for Nanoelectronics, Chemnitz University of Technology, Chemnitz 09126, Germany — 2Institute for Integrative Nanosciences, IFW Dresden, Helmholtzstraße 20, Dresden 01069, Germany — 3Institute for Complex Materials, IFW Dresden, Helmholtzstraße 20, Dresden 01069, Germany — 4Institute of Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden-Rossendorf, P.O. Box 510119, 01314 Dresden, Germany

Logarithmic spirals are found on different length scales in nature, e.g. in nautilus shells, cyclones, and galaxies. The underlying formation laws can be related with different growth mechanisms, pressure gradients, and density waves. Here we report on the self-organized formation of symmetric logarithmic crystallization spirals in a solid material on the micrometer length scale, namely in an amorphous Ge:Mn layer on a Ge substrate. After exposure to a single light pulse of a flashlamp array, the Ge:Mn layer is crystallized and reveals a partially rippled surface and logarithmic microspirals. Finally, we present a model describing the formation of the crystallization spirals by directional explosive crystallization of the amorphous Ge:Mn layer which is triggered by the flashlamp light pulse.

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