报告题目:Propagation of short waves in ferrites with damping and inhomogeneous exchange effects

报告人：林机、 刘晓军、高超

报告时间：14：00

报告地点：朝晖校区教409

报告地点：朝晖校区教409

一、报告题目：Propagation of short waves in ferrites with damping and inhomogeneous exchange effects 

报告摘要：We have investigated solutions of the KMM system in two cases for s=0 and s≠0) by the CTE method and the Painlevé-Bācklund transformation, for the case(s=0), the KMM system is integrable. There are many new type structures ofsolutions obtained., such as breather soliton, multipole instanton and rogue waves.Rogue waves have different structures including butterfly-type, X-type and Y-typeones. We also study in details the effects of Gilbert-damping andinhomogeneous exchange on the propagation of short waves in various saturated garnet ferrites. 

报告人： 林机教授，浙江师范大学物理学院
报告时间：2020年1月11日星期六下午 2:00—2:45

 

二、报告题目：带自相容源可积系统的构造和求解

报告摘要： 从Lax对出发，通过引进新的变量，进而构造新的带自相容源的可积系统。对于得到的新系统，再利用Hirota双线性方法给出各种类型的精确解，如N-soliton解等。

报告人： 刘晓军博士，中国农业大学应用数学系
报告时间地点：2020年1月11日星期六下午 2:50—3:35
 

三、报告题目：Aspects of symmetries in quantum dynamics

报告摘要：Symmetry is an essential theme in quantum physics. Based on some recent progresses in the field of ultracold atomic gases, I will discuss several aspects of symmetries, especially the scaling symmetry, in the dynamics of quantum systems. In the first part, I will present the construction of a special fractal [1], which is inspired by the similarity between the Weierstrass function and quantum systems with discrete scaling symmetry. In the second part, I will discuss the role of symmetries played in a two-dimensional degenerate Bose gas subjected to a harmonic trap, including the undamped breathing mode due to the SO(2,1) symmetry, and the intriguing periodic/revival behavior related to the initial shapes recently observed in experiment [2] and our preliminary understanding.

报告人：高超博士，浙江师范大学物理学院
报告时间地点：2020年1月11日星期六下午 3:40—4:15