Orbital Feshbach Resonance in Alkaline-Earth atoms

报告题目：Orbital Feshbach Resonance in Alkaline-Earth atoms

报告时间：11月8日（本周二）下午16：00

报告地点：基础学科大楼二楼大会议室B253

报告 人：Ren Zhang(张仁) ( Institute for Advanced Study, Tsinghua University)

报告摘要：

For a mixture of alkaline-earth atomic gas in the long-lived excited state 3P0 and the ground state 1S0, in addition to nuclear spin, another ``orbital" index is introduced to distinguish these two internal states.  Recently, we propose a mechanism to induce Feshbach resonance between two atoms with different orbital and nuclear spin quantum numbers. Two essential ingredients are inter-orbital spin-exchanging process and orbital dependence of the Lande g-factors. Here the orbital degrees of freedom plays similar role as electron spin degree of freedom in magnetic Feshbach resonance in alkali-metal atoms. This resonance is particularly accessible for Yb-173 system. The BCS-BEC crossover in this system requires two fermion pairing order parameters, and displays significant difference comparing to that in alkali-metal system.