Designing hyperchaos and intermittency in semiconductor superlattices

Abstract

Weakly coupled semiconductor superlattices under dc voltage bias are excitable systems with many degrees of freedom that may exhibit spontaneous chaos at room temperature and act as fast physical random number generator devices. Superlattices with identical periods exhibit current self-oscillations due to the dynamics of charge dipole waves but chaotic oscillations exist on narrow voltage intervals. They disappear easily due to variation in structural growth parameters. Based on numerical simulations, we predict that inserting two identical sufficiently separated wider wells increases superlattice excitability by allowing wave nucleation at the modified wells and more complex dynamics. This system exhibits hyperchaos and varieties of intermittent chaos in extended dc voltage ranges. Unlike in ideal superlattices, our chaotic attractors are robust and resilient against noises and against controlled random disorder due to growth fluctuations.

6 pages, 4 figures

References in corpus (6)

• Coherence Resonance and Stochastic Resonance in an Excitable Semiconductor Superlattice
• A hybrid model for chaotic front dynamics: From semiconductors to water tanks
• Voltage switching and domain relocation in semiconductor superlattices
• Noise enhanced spontaneous chaos in semiconductor superlattices at room temperature
• Noise-enhanced chaos in a weakly coupled GaAs/(Al,Ga)As superlattice
• Enhancing Chaotic Behavior at room temperature in GaAs/(Al,Ga)As Superlattices

Cited by in corpus (2)

• Uncovering spatio-temporal patterns in semiconductor superlattices by efficient data processing tools
• Hyperchaos, intermittency, noise and disorder in modified semiconductor superlattices