Veranstaltungen
- 14. – 17. September 2026 (WIAS-ESH)
- Workshop/Konferenz: Neuro-symbolic AI, Mathematical Reasoning and Agents (NESYRE2026)
mehr ... Veranstaltungsort
Weierstraß-Institut, Anton-Wilhelm-Amo-Str. 39, 10117 Berlin, Erdgeschoss, Erhard-Schmidt-Hörsaal
Veranstalter
WIAS Berlin
- Donnerstag, 17.09.2026, 10:30 Uhr (WIAS-Library)
- Software and Data Seminar
Veronica Bove/Karsten Tabelow, WIAS Berlin:
Submitting your work to the WIAS publication server
mehr ... Veranstaltungsort
Weierstraß-Institut, Hausvogteiplatz 5-7, 10117 Berlin, R411
Abstrakt
The new publication server at WIAS (https://archive.wias-berlin.de) is now fully operational. It provides a centralized platform to manage and showcase our research output, including publications, monographs, contributions to edited volumes, preprints and software. This seminar provides an overview of the platform's essential guidelines and benefits, followed by a practical workshop where you will navigate the submission workflow firsthand. Join us to learn how to easily enter your data and upload your own contributions using this new tool.
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Software and Data Seminar
Veranstalter
WIAS Berlin
- Donnerstag, 17.09.2026, 14:00 Uhr (WIAS-406)
- Seminar Numerische Mathematik
Dr. Yiannis Hadjimichael, WIAS Berlin:
Semiconductor nanowires bent by a one-sided stressor shell: Modelling, simulation and experimental results
mehr ... Veranstaltungsort
Weierstraß-Institut, Anton-Wilhelm-Amo-Str. 39, 10117 Berlin, 4. Etage, Weierstraß-Hörsaal (Raum: 406)
Abstrakt
Strain engineering in semiconductor nanowires enables precise control of electronic properties through deformation, piezoelectric, and flexoelectric effects. Bending nanowires without fracturing produces large strain gradients that change the band-gap gradient via a deformation-potential interaction. Under extreme strain gradients, the system can generate not only quasi-electric fields but also actual electric fields arising from spatial variations in both piezoelectric and flexoelectric polarization. Thus, unlike quasi-electric fields, electrons and holes drift in opposite directions, which spatially separates charge carriers. In this talk, we present a finite-strain electromechanical model for strongly bent core/shell nanowires with different cross-sectional geometries. The model incorporates lattice-mismatch-induced strain and piezoelectricity under a one-sided stressor-shell heterostructure, as motivated by TEM experiments, and accounts for adatom diffusion and strain-energy minimization. We solve the coupled partial differential equations using the finite element method to obtain three-dimensional strain fields for zincblende and wurtzite GaAs nanowires. The results demonstrate the impact of physically accurate geometries and reveal significant consequences for torsion, chirality, and piezoelectricity. Furthermore, we discuss the model?s potential to disentangle piezoelectric and flexoelectric effects in GaAs polytypes. Ultimately, this approach could clarify how strain gradients and electric fields from piezoelectric and flexoelectric polarization collectively govern carrier dynamics.
Veranstalter
WIAS Berlin
- Mittwoch, 14.10.2026, 11:30 Uhr (WIAS-406)
- Seminar Interacting Random Systems
Azadeh Parvaneh, Universität Bielefeld:
tba
mehr ... Veranstaltungsort
Weierstraß-Institut, Anton-Wilhelm-Amo-Str. 39, 10117 Berlin, 4. Etage, Weierstraß-Hörsaal (Raum: 406)
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Seminar Interacting Random Systems
Veranstalter
WIAS Berlin
- Mittwoch, 28.10.2026, 11:30 Uhr (WIAS-406)
- Berliner Kolloquium Wahrscheinlichkeitstheorie
Lars Schröder, University of Twente:
tba
mehr ... Veranstaltungsort
Weierstraß-Institut, Anton-Wilhelm-Amo-Str. 39, 10117 Berlin, 4. Etage, Weierstraß-Hörsaal (Raum: 406)
Abstrakt
tba
Veranstalter
Humboldt-Universität zu Berlin
Technische Universität Berlin
WIAS Berlin
International Research Training Group 2544
- 3. – 6. November 2026 (WIAS-ESH)
- Workshop/Konferenz: Stochastic processes with reinforcement
mehr ... Veranstaltungsort
Weierstraß-Institut, Anton-Wilhelm-Amo-Str. 39, 10117 Berlin, Erdgeschoss, Erhard-Schmidt-Hörsaal
Veranstalter
WIAS Berlin
- Mittwoch, 18.11.2026, 11:30 Uhr (WIAS-406)
- Berliner Kolloquium Wahrscheinlichkeitstheorie
Ulrik Thinggaard Hansen, University of Innsbruck:
tba
mehr ... Veranstaltungsort
Weierstraß-Institut, Anton-Wilhelm-Amo-Str. 39, 10117 Berlin, 4. Etage, Weierstraß-Hörsaal (Raum: 406)
Abstrakt
tba
Veranstalter
Humboldt-Universität zu Berlin
Technische Universität Berlin
WIAS Berlin
International Research Training Group 2544
- Mittwoch, 18.11.2026, 14:15 Uhr (WIAS-ESH)
- Berliner Oberseminar „Nichtlineare partielle Differentialgleichungen” (Langenbach-Seminar)
Gianna Götzmann, Universität Augsburg:
Perturbed minimizing movements of time-dependent functionals on metric spaces
mehr ... Veranstaltungsort
Weierstraß-Institut, Anton-Wilhelm-Amo-Str. 39, 10117 Berlin, Erdgeschoss, Erhard-Schmidt-Hörsaal
Abstrakt
Minimizing movement schemes are a fundamental tool for approximating evolution equations that have a gradient-flow structure with respect to an energy. Motivated by homogenization problems involving, for instance, geometries that evolve in time, we consider Gamma-converging perturbations of time-dependent driving energies. We study the convergence of the corresponding minimizing movement scheme and provide sufficient conditions under which limits of the scheme are (time-dependent) curves of maximal slope for the limit energy. We further exhibit examples showing that, in general, such a stability property may fail, with the limit motion depending on the relation between the time-discretization parameter τ and the perturbation parameter ϵ. This is joint work with Jan-Frederik Pietschmann and Antonio Tribuzio.
Weitere Informationen
Oberseminar “Nichtlineare partielle Differentialgleichungen” (Langenbach-Seminar)
Veranstalter
Humboldt-Universität zu Berlin
WIAS Berlin