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

作　　者：杨癸 李远红 张凤英 李玉琦 

机构地区：[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 [4]Henan Institute of Science and Technology,Xinxiang 453003,China

出　　处：《Journal of Semiconductors》2012年第9期8-12,共5页半导体学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.11047108,11147197,11005003);the Research Project of Basic and Cutting-Edge Technology of Henan Province,China(No.112300410183);the Education Department of Henan Province, China(No.2011B140002)

摘　　要：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.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.

关 键 词：weakly-coupled superlattice current oscillation the hysteresis loop 

分 类 号：TN304[电子电信—物理电子学]