[Soft-matter] Soft Matter and Stat Phys seminar on 14 Jan 2022

[Maciej Lisicki]

Dear Soft Matter Colleagues and Friends,

On Friday 14 January 2022 at 9:30 AM at the UW Faculty of Physics (Pasteura 5, Warsaw; room 1.40) we are hosting a seminar during which

Magdalena Załuska-Kotur (Institute of Physics, Polish Academy of Sciences)

will give a talk

Step bunches, nanowires and other vicinal “creatures” resulting from surface dynamics

Abstract
Different patterns are created on the surface of the growing crystals, among which the step bunches and/or step meanders are of most studied. The Ehrlich-Schwoebel effect on surface steps is considered to be one of the “usual suspects” of such patterning. A direct step barrier means it is easier to attach a particle to the step from the lower terrace than from the upper terrace. In the process of crystal growth it leads to the formation of meanders, while an inverse barrier leads to the step bunching. I will show that the cellular automata model can be used to study surface patterning process. The proper combination of a direct and inverse step barrier and the correct selection of the potential of the well between them lead to the formation of bunched step structures, followed by the formation of anti-bands, and then changes in the height of the direct step barrier lead to the growth of nanocolumns, nanowires, and nanopyramids or meanders, in the same system. The universality of surface dynamics will be further explored by differential equations describing the evolution of the surface slope. The time scaling of the bunching process resulting from these equations is further compared with the experimental results.

We warmly welcome everyone to attend the talk and the Soft Matter Coffee Break after the seminar, held in room 4.51 (4th floor).

Maria Ekiel-Jeżewska
Maciej Lisicki
Piotr Szymczak

--
dr hab. Maciej Lisicki
Institute of Theoretical Physics | Faculty of Physics
University of Warsaw
softmatter.fuw.edu.pl <http://softmatter.fuw.edu.pl/>






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