2022-10-11
举办单位：激光光谱研究所
负责人姓名：张文学
电话：13934146775
活动主题：phase transition from atomic to molecular condensate and quantum many-body dynamics
形式：线上
活动内容摘要：
molecular quantum gases (that is, ultracold and dense molecular gases) have many potential applications, including quantum control of chemical reactions, precision measurements, quantum simulation and quantum information processing1,2,3. for molecules, to reach the quantum regime usually requires efficient cooling at high densities, which is frequently hindered by fast inelastic collisions that heat and deplete the population of molecules. here we report the preparation of two-dimensional bose–einstein condensates (becs) of spinning molecules by inducing pairing interactions in an atomic condensate near a g-wave feshbach resonance. we investigate the unpairing dynamics in the strong coupling regime and find that near the feshbach resonance the dynamical timescale is consistent with the unitarity limit. our work demonstrates the long-sought transition between atomic and molecular condensates, the bosonic analogue of the crossover from a bec to a bardeen−cooper−schrieffer (bcs) superfluid in a fermi gas. in addition, our experiment may shed light on condensed pairs with orbital angular momentum, where a novel anisotropic superfluid with non-zero surface current is predicted , such as the a phase of 3he.
主讲人基本情况：
张振东，男，1995年，本科毕业于华中科技大学，博士毕业于美国芝加哥大学，现为美国斯坦福大学教师。博士期间，师从冷原子与量子模拟领域著名科学家cheng chin教授，以第一作者发表nature、nature physics论文。
听众范围：30
举办时间：2022年9月30日
举办地点：线上
报告类型：理科类