您好!今天是2019年12月15日 星期日
加入收藏| 设为首页| 联系方式
网站首页
欢迎来到:中国科学院量子信息重点实验室
实验室概况
实验室介绍| 机构设置| 历史沿革| 联系我们
科研体系
固态量子计算研究单元| 量子纠缠网络研究单元| 量子集成光学芯片研究单元| 量子密码与量子器件研究单元| 量子理论研究单元
科研成果
研究进展| 获奖| 论文与专著| 专利
实验室成员
固定成员| 双聘人员| 博士后| 招聘信息
科普中心
郭光灿的量子十问 | 来自量子世界的新技术
研究生园地
研究生招生| 博士答辩
新闻中心| 公告通知| 学术报告| 媒体关注| 友情链接

首页栏目

当前位置:首页>首页栏目> 学术报告

学术报告


5月15日江开军报告

发布时间:2019-05-14

报告时间:5月15日 周三 下午2:00

报告地点:实验室一楼会议室

报告人:武汉物理与数学研究所江开军研究员

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

报告摘要: 

     Coupling between particle’s spin and orbital motion 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 features 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.
    [1] D. Zhang, T. Gao, P. Zou, L. Kong, R. Li, X. Shen, X. Chen, S. Peng, M. Zhan, H. Pu, and K. Jiang, Phys. Rev. Lett. 122, 110402 (2019)
    [2] T. Gao, J. Pan, D. Zhang, L. Kong, R. Li, X. Shen, X. Chen, S. Peng, M. Zhan, W. V. Liu, and K. Jiang, arXiv: 1805.04727 (2018)
     [3] T. Gao, D. Zhang, L. Kong, R. Li , K. Jiang, Chin. Phys. Lett. 35, 086701 (2018)