摘要
周期偏压Vdc+ Vacsin(2πfact) 驱动下的微带超晶格构成一个多自由度的非线性动力学系统。交流偏压的振幅Vac、频率fac 和直流偏压Vdc 可作为该超晶格非线性系统的控制参数。本文采用流体力学平衡方程方法研究了周期偏压条件下具有N+ NN+ 结构的超晶格器件非线性动力学特性。计算表明,随着控制参数Vac 的变化,超晶格中的电流出现周期倍频和时空混沌现象,其Poincaré分支图十分复杂。
When driven by a dc and an ac bias voltage in the form of V dc +V ac sin(2πf ac t), the miniband superlattice constructs a typical nonlinear dynamic system with the dc bias, ac amplitudes and the ac frequency as the control parameters. We use the time dependent hydrodynamic balance equation approach to investigate the nonlinear dynamical characteristics of a periodically driven N +NN + miniband superlattice system. It is shown that with changing the ac amplitude the solutions of the system become period doubling or chaotic with a quite complex Poincar'e bifurcation scenario.
出处
《功能材料与器件学报》
CAS
CSCD
1999年第3期201-206,共6页
Journal of Functional Materials and Devices
基金
国家自然科学基金
上海市青年科技启明星基金