Controlling Chaos

Professor Eckerhard Schöll

Institut für Theoretische Physik, TU Berlin, Germany

Friday , 15 June 2007, 13:30
Lecture room F, Physics Department, Sölvegatan 14

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.

Everybody is welcome!

Gösta Gustafson       Sven Åberg

Theoretical physics Mathematical physics