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DY: Dynamik und Statistische Physik

DY 40: Nonlinear dynamics III

DY 40.2: Talk

Thursday, March 27, 2003, 10:00–10:15, G\"OR/226

Chaos control of high frequency oscillations in semiconductor superlattices — •Jan Henning Schlesner¹, Andreas Amann¹, Natalia Janson^1,2, Wolfram Just^1,3, Nursel Kilic¹, and Eckehard Schöll¹ — ¹Institut für Theoretische Physik, Technische Universität Berlin, Hardenbergstrasse 36, D–10623 Berlin, Germany — ²Department of Physics, Lancaster University, Lancaster, LA1 4YB, United Kingdom — ³Theoretische Physik I, Technische Universität Chemnitz, D–09107 Chemnitz, Germany

We present a novel scheme to stabilize chaotic oscillations in semiconductor superlattices by time delayed feedback control. We explore the parameter regimes where complex chaotic scenarios occur due to the spatio-temporal dynamics of fronts of accumulation and depletion layers which are generated at the emitter and may collide and annihilate during their transit. Chaos control is effected by time-delay autosynchronisation using a low-pass filtered global signal.