Abstract

AbstractWe investigate the influence of extended time delayed feedback upon the spatio‐temporal current density patterns in a double barrier resonant tunnelling diode. The parameters of the device are chosen to reflect a situation where the only stable state of the system is a spatially inhomogeneous ”filamentary” steady state. The addition of weak Gaussian white noise to the system gives rise to spatially inhomogeneous self‐sustained temporal oscillations that can be quite coherent. Applying a single time delayed feedback can either increase or decrease the regularity of the noise‐induced spatio‐temporal dynamics. In this work we show that using multiple time delayed feedback provides means to increase the temporal regularity even further and to enlarge the parameter regime in which no delay‐induced bifurcations occur. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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