Self-organized pattern formation arises in various nonlinear dynamic systems. Our focus is on control of those patterns by time-delayed feedback methods [1]. On one hand, deterministic chaos can be suppressed, and unstable periodic orbits and fixed points can be stabilized. On the other hand, purely noise-induced patterns can be considered, and their temporal coherence and time-scales can be controlled. Our findings are applied to different classes of semiconductor nanostructures [2]: (i) Nonlinear spatio-temporal dynamics of double-barrier resonant-tunneling (DBRT) diodes; (ii) Charge carrier fronts and field domains in superlattices; (iii) Relaxation oscillations in semiconductor lasers

[1] E. Schöll and H.G. Schuster (Editors): Handbook of Chaos Control (Wiley-VCH, Weinheim, 2007), second completely revised and enlarged edition.
[2] E. Schöll, Nonlinear spatio-temporal dynamics and chaos in semiconductors (Cambridge University Press, Cambridge, 2001, Paperback 2005).


The Colloquia in Theoretical Physics are aimed for a general audience of students, teachers and researchers interested in physics and the laws of Nature. Coffee will be served after the colloquium outside the lecture room.


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Gösta Gustafson       Sven Åberg

Theoretical physics Mathematical physics