报告人：Prof. Boris A. Malomed   

报告人单位：Tel Aviv University（特拉维夫大学，以色列）   

主持人：黄国翔教授   

时间：2022年10月12日星期三下午14:00-15:00   

地点：闵行校区光学大楼A508会议室   

腾讯会议 ID：543-533-107   

报告人简介：

Boris Malomed was born in Minsk (Belarus). He had received MS in physics from the Belorussian State University (Minsk) in 1977, PhD in theoretical physics from the Moscow Institute of Physics and Technology in 1981, and the Doctor of Sciences degree in theoretical physics from the N. N. Bogoliubov Institute for Theoretical Physics, Ukrainian Academy of Sciences (Kiev) in 1989. Till 1991, he was a senior researcher at the Institute for Oceanology of the Russian Academy of Sciences (Moscow). Since 1991, he was an Associate Professor, and since 1998 a Full Professor at Tel Aviv University. Since 2015, he is a holder of a personal research chair Optical solitons funded by the Tel Aviv University. He has published 1,200+ papers and three books. His h-index is 82 (Web of Science) / 95 (Google Scholar). He is an editor of two major international journals, Physics Letters A and Chaos, Solitons & Fractals, and an Editorial Board member of Journal of Optics, Symmetry, Photonics, Scientific Reports, Optics Communications, and Chaos. He is a Senior Member of the Optical Society of America (recently renamed to Optica). The link to his homepage: https://www.eng.tau.ac.il/~malomed

报告内容简介：

It is commonly known that the interplay of linear and nonlinear effects gives rise to solitons, i.e., self-trapped localized structures, in a wide range of physical settings, including optics, Bose-Einstein condensates (BECs), hydrodynamics, plasmas, condensed-matter physics, etc. Nowadays, solitons are considered as an interdisciplinary class of modes, which feature diverse internal structures. 

While most experimental realizations and theoretical models of solitons have been elaborated in one-dimensional (1D) settings, a challenging issue is prediction of stable solitons in 2D and 3D media. In particular, multidimensional solitons may carry an intrinsic topological structure in the form of vorticity. In addition to the simple vortex solitons, fascinating objects featuring complex structures, such as hopfions, i.e., vortex rings with internal twist, have been predicted too.

A fundamental problem is the propensity of multidimensional solitons to be unstable (naturally, solitons with a more sophisticated structure, such as vortex solitons, are more vulnerable to instabilities). Recently, novel perspectives for the creation of stable 2D and 3D solitons were brought to the attention of researchers in optics and BEC. The present talk aims to provide an overview of the main results and ongoing developments in this vast field. An essential conclusion is the benefit offered by the exchange of concepts between different areas, such as optics, BEC, and hydrodynamics.