时间: 2019年10月22日10:00-11:30

地点: 沧海校区致腾楼811

报告人: 张若洋 香港科技大学 物理系 研究助理教授

报告内容:

The concept of gauge field is a cornerstone of modern physics and the synthetic gauge field has emerged as a new way to manipulate particles in many disciplines. In optics, several schemes have been proposed to realize synthetic gauge fields, but most are limited to the Abelian type. In this talk, we introduce a new platform for realizing synthetic SU(2) non-Abelian gauge fields acting on two dimensional optical waves in a wide class of anisotropic materials and discover new phenomena. We show that a virtual non-Abelian Lorentz force arising from material anisotropy can induce light beams to travel along Zitterbewegung trajectories even in homogeneous media. We further design an optical non-Abelian Aharonov–Bohm system which results in the exotic spin density interference effect. We also exhibit how to extract the Wilson loop of an arbitrary closed optical path from a series of gauge fixed points in the interference fringes. Our scheme offers a new route to study SU(2) gauge field related physics using optics.

报告人简介:

张若洋，2010年本科毕业于南开大学物理学院，2016年博士毕业于南开大学陈省身数学研究所理论物理研究室，随后在香港科技大学物理系开展博士后研究工作至今，现为港科大研究助理教授。目前已在Nature Communications, Physical Review letters等期刊发表SCI论文19篇。主要研究方向包括拓扑光子学，光的自旋轨道耦合, 变换光学等。