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DY: Dynamik und Statistische Physik

DY 32: Nonlinear Stochastic Systems II

DY 32.3: Talk

Monday, March 7, 2005, 14:45–15:00, TU H3010

Noise-induced pattern formation in a semiconductor nanostructure — •Grischa Stegemann, Alexander G. Balanov, and Eckehard Schöll — Institut für Theoretische Physik, Technische Universität Berlin, D-10623 Berlin, Germany

We study the influence of noise upon the dynamics of the current density distribution in a model of a semiconductor nanostructure, namely, a double barrier resonant tunnelling diode. We fix the parameters of the system at values below the Hopf bifurcation where the only stable state of the system is a spatially inhomogeneous "filamentary" steady state. We show that the addition of weak Gaussian white noise to the system gives rise to spatially inhomogeneous oscillations. As the noise intensity grows, the oscillations tend to become more and more spatially homogeneous, while simultaneously the temporal coherence of the oscillations decreases.