Abstract:

We investigate the ground-state phases of ultracold gases composed of bosonic microwave-shielded polar molecules (MSPMs). Using a translational symmetry-breaking variational ansatz with Jastrow correlations, we characterize the many-body correlations arising from the large shielding core of the two-body potential in a dense gas. We show that the molecular gases are always stabilized by the shielding potential and support a self-bound gas phase and an expanding gas phase. Furthermore, analogous to liquid 4 He, we find that the condensate fraction is significantly reduced when the size of the shielding core of the two-body potential becomes comparable to the inter-molecular distance. For experimental detection, we also identify a bimodal feature in the momentum distribution. Our work invalidates the application of the Gross-Pitaevskii equation to molecular gases and establishes a universal framework to reveal the many-body correlations in dense molecular gases.

Short Bio:

易俗，宁波大学教授。2002年获得美国佐治亚理工学院博士学位。2002年5月至2006年1月期间先后在美国佐治亚理工学院和莱斯大学从事博士后研究。2005年10月入选中国科学院“百人计划”，2010年获国家杰出青年科学基金资助。主要从事超冷原子分子物理、量子模拟与量子精密测量等方向的理论研究，共发表SCI学术论文80余篇。