报告题目（Title）：Spin-orbital-angular-momentum coupled Bose-Einstein condensates
报 告 人（Speaker）：张云波 教授（山西大学理论物理研究所）
报告时间（Time）：2019年4月15日（周一）10：00
报告地点（Place）：校本部G309
邀请人（inviter）：姜颖
报告摘要（Abstract）：
Since the first experimental realization of synthetic spin-orbit (SO) coupling induced by a pair of Raman beams in a Rb Bose-Einstein condensate (BEC), SO coupled quantum gases have emerged as one of the most active frontiers in cold-atom research. SO coupling has been realized in both bosonic and fermionic atoms. Various theoretical models based on the Raman process have been proposed and are predicted to give rise to a variety of rich many-body quantum phases. I will talk about a simple model with spin and orbit angular momentum (SOAM) coupling in a spin-1 Bose-Einstein condensate, where three internal atomic states are Raman coupled by a pair of co-propagating Laguerre-Gaussian beams. Focusing on a regime where the single-particle ground state is nearly three-fold degenerate, it is shown that the weak interatomic interaction in the condensate produces a rich phase diagram, and that a many-body Rabi oscillation between two quantum phases can be induced by a sudden quench of the quadratic Zeeman shift. Some features of the quantum phase transition and spin textures have been observed in recent two experimental groups in Wuhan and Taipei.
