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arXiv 1906.02445nlin.CDcond-mat.mtrl-sci
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含忆阻元件混沌系统的无参数分岔

Bifurcation without parameters in a chaotic system with a memristive element

Tom Birkoben, Moritz Drangmeister, Finn Zahari, Serhiy Yanchuk, Philipp Hövel, Hermann Kohlstedt

摘要:

从实验和理论上研究了记忆对混沌系统的影响。为了这个目的,我们使用蔡氏振荡器作为一个电模型系统,显示混沌动力学扩展的存储元件的形式的双势垒忆阻器件。该器件由Au/NbO $_\text{x}$ /Al $_\text{2}$ O $_\text{3}$ /Al/Nb层组成,并表现出依赖于电荷流历史的强模拟型电阻变化。在扩展的系统中,可以观察到混沌振荡动力学的强烈变化。否则波动的蔡氏系统的振幅被破坏的瞬态沉默状态。在开发了具有忆阻器件的蔡氏振荡器的模型之后,数值处理揭示了由存储元件的慢-快动力学驱动的底层动力学。此外,稳定和不稳定的动态分岔被确定的系统通过其混沌行为。

英文摘要:

We investigate the effect of memory on a chaotic system experimentally and theoretically. For this purpose, we use Chua's oscillator as an electrical model system showing chaotic dynamics extended by a memory element in form of a double-barrier memristive device. The device consists of Au/NbO$_\text{x}$/Al$_\text{2}$O$_\text{3}$/Al/Nb layers and exhibits strong analog-type resistive changes depending on the history of the charge flow. In the extended system strong changes in the dynamics of chaotic oscillations are observable. The otherwise fluctuating amplitudes of the Chua system are disrupted by transient silent states. After developing a model for Chua's oscillator with a memristive device, the numerical treatment reveals the underling dynamics as driven by the slow-fast dynamics of the memory element. Furthermore, the stabilizing and destabilizing dynamic bifurcations are identified that are passed by the system during its chaotic behavior.

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