半导体超晶格中相干共振的控制
Control of coherence resonance in semiconductor superlattices
摘要：
本文研究了时滞反馈控制和高斯白噪声对半导体超晶格中时空电荷动力学的影响。该系统是准备在一个政权的确定性动力学是接近一个全球性的分歧，即鞍结分歧的极限环（{ \it SNIPER}）。在没有控制的情况下，噪声可以诱导电子电荷前沿运动通过整个设备，并观察到相干共振。结果表明，通过适当地选择延时反馈参数，相干共振的影响既可以增强也可以被破坏，从而显著地提高了低噪声强度下随机畴运动的相干性.此外，研究了系统的纯时滞诱导动力学，发现了一个极限环的同宿分支。
英文摘要：
We study the effect of time-delayed feedback control and Gaussian white noise on the spatio-temporal charge dynamics in a semiconductor superlattice. The system is prepared in a regime where the deterministic dynamics is close to a global bifurcation, namely a saddle-node bifurcation on a limit cycle ({\it SNIPER}). In the absence of control, noise can induce electron charge front motion through the entire device, and coherence resonance is observed. We show that with appropriate selection of the time-delayed feedback parameters the effect of coherence resonance can either be enhanced or destroyed, and the coherence of stochastic domain motion at low noise intensity is dramatically increased. Additionally, the purely delay-induced dynamics in the system is investigated, and a homoclinic bifurcation of a limit cycle is found.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
