Chaotic dynamics dependence on doping density in weakly coupled GaAs/AlAs superlattices

A discrete sequential tunneling model is used for studying the influence of the doping density on the dynamical behaviors in weakly coupled GaAs/AlAs superlattices. Driven by the DC bias, the system exhibits self- sustained current oscillations induced by the period motion of the unstable electric f...

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Published inJournal of semiconductors Vol. 33; no. 9; pp. 8 - 12
Main Author 杨癸 李远红 张凤英 李玉琦
Format Journal Article
LanguageEnglish
Published 01.09.2012
Subjects
Chaos theory
Density
Doping
Electric potential
GaAs
Gallium arsenide
Gallium arsenides
Semiconductors
Superlattices
周期运动
弱耦合
掺杂浓度
混沌动力学
电流密度
超晶格
驱动频率
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ISSN1674-4926
DOI10.1088/1674-4926/33/9/092002

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Summary:A discrete sequential tunneling model is used for studying the influence of the doping density on the dynamical behaviors in weakly coupled GaAs/AlAs superlattices. Driven by the DC bias, the system exhibits self- sustained current oscillations induced by the period motion of the unstable electric field domain, and an electrical hysteresis in the loop of current density voltage curve is deduced. It is found that the hysteresis range strongly depends on the doping density, and the width of the hysteresis loop increases with increasing the doping density. By adding an external driving ac voltage, more complicated nonlinear behaviors are observed including quasi- periodicity, period-3, and the route of an inverse period-doubling to chaos when the driving frequency changes.
Bibliography:A discrete sequential tunneling model is used for studying the influence of the doping density on the dynamical behaviors in weakly coupled GaAs/AlAs superlattices. Driven by the DC bias, the system exhibits self- sustained current oscillations induced by the period motion of the unstable electric field domain, and an electrical hysteresis in the loop of current density voltage curve is deduced. It is found that the hysteresis range strongly depends on the doping density, and the width of the hysteresis loop increases with increasing the doping density. By adding an external driving ac voltage, more complicated nonlinear behaviors are observed including quasi- periodicity, period-3, and the route of an inverse period-doubling to chaos when the driving frequency changes.
11-5781/TN
weakly-coupled superlattice; current oscillation; the hysteresis loop
Yang Gui , Li Yuanhong , Zhang Fengying , and Li Yuqi 1 College of Physics ＆ Electrical Engineering, Anyang Normal University, Anyang 455000, China 2 School of Physics and Electronics, Henan, University, Kaifeng 475004, China 3 Department of General Education, Henan Vocational College of Chemical Technology, Zhengzhou 450002, China 4Henan Institute of Science and Technology, Xinxiang 453003, China
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ISSN:1674-4926
DOI:10.1088/1674-4926/33/9/092002