SPAM - Science, Pizza And Mathematics

Phase-field simulation of solid-state dewetting and selective-area growth: arbitrary pattern geometry and crystal faceting

Abstract: The interest toward quantum technologies is driving research to develop devices with high crystalline quality and precise control over their morphologies at the nanoscale. Among the several techniques, growing materials on top of dielectric masks offers the possibility to achieve tailored architectures by exploiting either solid-state dewetting or selective-area growth (SAG) dynamics. This involves a complex interplay between crystal faceting and pattern geometries. To tackle this problem, we discuss a phase-field model comprising both surface diffusion and deposition of a crystalline material on arbitrarily-shaped substrates. In particular an auxiliary order parameter is introduced to map the contact-angle boundary condition on a generic non-planar profile. Extensive three-dimensional simulations of solid-state dewetting of thin layers and nanoparticles are performed (Figure 1), varying both the wetting parameter and crystallographic orientation, testing consistency with Young-Herring Law for faceted shapes. An external flux is then included to reproduce SAG dynamics, inspecting the competition between thermodynamic and kinetic driving forces. The morphological evolution of PbSnTe nanostructures is inspected and compared with experimental data.

Vortragender: Emma Radice

TBA

Vortragender: TBA

Two Dimensional Multiphase Field Models of Collective Cell Migration in a Confinement

Vortragender: Osman Abhimata Nugraha

Morphological and Topological Description of Hyperuniformity

Vortragender: Abel Henri Guillaume Milor

Extended phase-field crystal models of solidification

Vortragender: Maik Punke

A phase-field model of elastic surfaces in flow

Vortragender: Maximilian Kloppe

Amplitude Phase-Field Quasicrystal

Vortragender: Marcello de Donno

Pattern formation on deforming active viscoelastic surfaces

Vortragender: Eloy de Kinkelder

StreAMDiS - Accurate streamlines computation with AMDiS.

Vortragender: Mirko Residori

Fieldsplit preconditioners for Dune-AMDiS using the PETSc library - overview, application and limitation

Vortragender: Veit Krause

Bending models for liquid crystal elastomers

Vortragender: Max Griel

Numerical Simulation of Cellular Deformation by Passive and Active Flows

Vortragender: Lucas Wittwer

Numerical Simulation of Cellular Deformation by Passive and Active Flows

Vortragender: Lisa Nebel

AMDiScussion: current challanges

Vortragender: Mirko Residori

Surface Stokes Equations in Stream Function Formulation
Vortragender: Philip Brandner

30.01.2020