Chaotic front dynamics in semiconductor superlattices

Abstract

We analyze the dynamical evolution of the current and the charge density in a superlattice for fixed external dc voltage in the regime of self-sustained current oscillations, using a microscopic sequential tunneling model. Fronts of accumulation and depletion layers which are generated at the emitter may collide and annihilate, thereby leading to a variety of different scenarios. We find complex chaotic regimes at high voltages and low contact conductivities.

4 pages, 4 figures

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• High-Frequency Impedance of Driven Superlattices
• Enhancing Chaotic Behavior at room temperature in GaAs/(Al,Ga)As Superlattices
• Parameter dependence of high-frequency nonlinear oscillations and intrinsic chaos in short GaAs/(Al,Ga)As superlattices
• Two dimensional collective electron magnetotransport, oscillations and chaos in a semiconductor superlattice
• Hyperchaos, intermittency, noise and disorder in modified semiconductor superlattices