理麻豆视数理讲坛（2017年第08讲）
报告题目：Bose-Einstein condensate in an optical lattice with Raman-assisted two-dimensional spin-orbit coupling
报告人： 易为 教授
单 位：中国科技大学
报告时间：2017年4月7日（星期五）10:15-11:15
报告地点：龙赛理科楼北楼311
报告摘要：In a recent experiment by Wu et al., a Raman-assisted two-dimensional spin-orbit coupling has been realized for a Bose-Einstein condensate in an optical lattice potential. In light of this exciting progress, we study in detail key properties of the system. As the Raman lasers inevitably couple atoms to high-lying bands, the behaviors of the system in both the single- and many-particle sectors are significantly affected. In particular, the high-band effects enhance the plane-wave phase and lead to the emergence of rotongaps at low Zeeman fields. Furthermore, we identify high-band-induced topological phase boundaries in both the single-particle and the quasi-particle spectra. We then derive an effective two-band model, which captures the high-band physics in the experimentally relevant regime. Our results not only offer valuable insights into the novel two-dimensional lattice spin-orbit coupling, but also provide a systematic formalism to model high-band effects in lattice systems with Raman-assisted spin-orbit couplings.
报告人简介：
易为，教授，博士生导师，2000年毕业于中国科技大学应用物理系, 2007年在美国密歇根大学物理系获博士学位。2007-2010 在奥地利因斯布鲁克大学从事超冷原子量子仿真的理论研究工作。2010年5月至中国科技大学中科院量子信息重点实验室工作， 并于2015年获自然科学基金委优秀青年科学基金支持。易为教授研究兴趣主要集中在超冷原子体系量子仿真的理论刻画及实验方案设计两方面。