*主持人：陈勇 教授
*时间：2020年11月17日13:00-14:00
*地点：腾讯会议(会议 ID：821 232 690)

*讲座内容简介：
In this talk, we study the parity-time-(PT )-symmetric optical couplers with the cubic both self- and cross interactions corresponding to self- and cross-phase modulations. When the coefficient of the cubic cross-interaction is chosen as the different values, we find three distinct cases for two branches, including the stable-stable modes (linear unbroken PT -symmetric phase), stable-unstable modes (linear unbroken PT -symmetric phase), as well as unstable-unstable modes (linear broken PT -symmetric phase). Moreover, we find the periodic trajectories for some parameters. Similarly, we also explore the PT -symmetric optical couplers with cubic-quintic self-phase modulations. We numerically give the stable and unstable regions of the cubic-quintic system. Moreover, we also find the periodic trajectories for some parameters in the Stokes domain.

*主讲人简介：
李昕，中国科学院数学与系统科学研究院博士，常熟理工学院副教授。研究主要方向数学物理方程, 在《Applied Mathematics Letters》、《Chaos》、《Journal of Mathematical Physics》与《Nonlinear Dynamics》等国内学术期刊上发表论文10余篇。