1.学术报告 

报告题目：Giant Kerr nonlinearity, slow-light bullets & vortices, and their active manipulation in Rydberg atomic gases

报告人：黄国翔   华东师范大学终身教授

时间：2019年4月25日  上午9：30

地点：大学城校区理六栋220

报告摘要：In recent years, much attention has been paid to the study of ultracold Rydberg atomic gases. In this talk, we give a presentation of our recent research on the nonlinear optical property of such gases under the condition of electromagnetically induced transparency (EIT). Based on a theoretical approach beyond mean-field theory, we show that, due to the strong atom-atom interaction, ultracold Rydberg gases have giant third-order and fifth-order Kerr nonlinearities much larger than conventional materials, and Rydberg-EIT has faster response speed than conventional EIT, which are useful for many potential applications. Moreover, we show that such systems allow to realize stable (3+1)-dimensional spatiotemporal optical solitons (alias light bullets) and vortices, which have very slow propagation velocity, extremely low generation power, and can be stored and retrieved with high efficiency and fidelity through an active manipulation of control laser field.

报告人简介：

黄国翔，华东师范大学终身教授、二级教授。1991年毕业于复旦大学物理系，获理学博士学位。1994年至1998年在德国马克斯-普朗克研究所,西班牙马德里大学任博士后研究员与客座科学家。先后访问美国国家标准与技术研究院, 法国巴黎第七大学和意大利国际理论物理中心等高校与科研单位。多年来一直从事非线性物理与非线性光学方面的研究。先后负责和参加国家自然科学基金重大研究计划项目、国家自然科学基金重点项目?国家自然科学基金面上项目?国家973项目?教育部跨世纪人才基金?教育部骨干青年教师基金等项目。已在国内外主要物理学学术刊物上发表研究论文200余篇?其中国外出版的著名物理学杂志170余篇(包括 Physical Review 系列70余篇?SCI收录180余篇)?SCI他引2000余次。若干理论研究结果已为国内外实验所证实。多次应邀在国内外学术会议上作学术报告。2004年应邀在国际力学科学中心（意大利）主办的学术研讨会上作 "玻色-爱因斯坦凝聚中的元激发"系列学术讲座。1993、1995年获上海市高校优秀青年教师称号?1996年选拔为华东师大首批跨世纪学术带头人?1997年获国家教委科技进步二等奖?1999年入选教育部跨世纪优秀人才?2000年获国务院特殊津贴。

2.学术报告 

报告题目：Phase transition in a spin-orbital-angular-momentum coupled Bose-Einstein condensate

报告人：江开军  中国科学院武汉物理与数学研究所研究员 

时间：2019年4月25日  上午10：30

地点：大学城校区理六栋220

报告摘要：Coupling between particle’s spin and orbital motion (linear momentum or orbital angular momentum) is ubiquitous in atoms, photons, solid materials and many other systems. It contributes to the topological properties like quantum-Hall effect in solid materials and electronic fine structure in atoms. Ultracold atoms with a high tunability provides an ideal platform to study spin-orbit (SO) coupling. Spin-linear-momentum (SLM) coupling has been observed in quantum gases and subsequently a variety of exotic quantum states have been explored. While the experimental study on the other kind of SO coupling, namely the spin-orbital-angular-momentum (SOAM) coupling, is still lacking.

In this talk, I will report the experimental observation of the ground-state phase diagram of the SOAM coupled Bose-Einstein condensate. By inducing a Raman transition using a pair of Gaussian and Laguerre-Gaussian (LG) laser beams, we realize SOAM coupling of ultracold atoms. We observe phase transitions when the two-photon Raman coupling strength or detuning approaches the critical value. The phase transitions are classified as the first order, which feature a discontinuous jump of the angular momentum (OAM) and the spin polarization. We demonstrate the hysteresis loop across the first-order phase transition. The role of interatomic interaction on the phase transition is also elucidated. 

报告人简介：

江开军，中科院武汉物理与数学研究所研究员。1994-1998，武汉大学，学士学位；1998-1999，中科院武汉物理与数学研究所，研究助理；1999-2005，中科院武汉物理与数学研究所，博士学位；2005-2008，美国National Institute of Standard and Technolody（NIST），博后；2008-2009，法国Laboratoire Kastler Brossel (LKB), Ecole Normale Superieure (ENS),博后；2009-至今，中科院武汉物理与数学研究所，研究员。先后在nature，PRL，PRA，PRE等期刊上发表论文。现为APS期刊审稿人。

研究领域：超冷简并费米气体中的多体相互作用；冷分子的形成及其热力学行为。