报告题目：Realization of an ideal Weyl semimetal band in a quantum gas with 3D spin-orbit coupling
报告人：陈帅教授（中国科学技术大学）
报告时间：2021年7月8日（星期四）下午3:00—4:00
报告地点：激光光谱研究所三层报告厅
报告简介：
The Weyl semimetals are three-dimensional (3D) gapless topological phases with Weyl cones in the bulk band, and host massless quasiparticles known as Weyl fermions which were theorized by Hermann Weyl in the last twenties. The lattice theory constrains that Weyl cones must come in pairs, with the minimal number of cones being two. The semimetal with only two Weyl cones is an ideal Weyl semimetal (IWSM) which is the optimal platform to explore broad Weyl physics but hard to engineer in solids. Here, we report the experimental realization of the IWSM band by synthesizing a 3D spin-orbit (SO) coupling for ultracold atoms. Engineering a 3D configuration-tunable optical Raman lattice, we realize the Weyl-type SO coupling for ultracold quantum gas, with which the IWSM band is achieved with controllability. The topological Weyl points are clearly measured via the virtual slicing imaging technique in equilibrium, and further resolved in the quench dynamics, revealing the key information of the realized IWSM bands. The realization of the IWSM band opens an avenue to investigate various exotic phenomena based on the optimal Weyl semimetal platforms.
报告人简介：
陈帅，中国科学技术大学／中国科学院量子信息与量子技术创新研究院教授，国家杰出青年科学基金获得者。长期从事超冷原子量子模拟和量子精密测量方面的研究。在超冷原子量子模拟方面，分别首次实现二维和三维自旋轨道耦合的超冷量子气体，在此基础上开拓了动力学拓扑研究的新方向，为拓扑量子物态和拓扑相变的研究开辟了一条新道路。在量子精密测量方面，致力于将超冷原子的量子操控技术与实际应用相结合，研制高精度小型化可搬运的原子干涉重力仪工程样机，实现了在外场安静环境下长时间无人值守的连续重力测量。在Science (2篇)、Nature (1篇)、Nature子刊(4篇)、Phys. Rev. Lett. (13篇)等国际权威学术期刊上发表论文40余篇，被SCI引用2500余次。