报告题目：Orbital Feshbach Resonance in Alkali-Earth Atoms

报告人：张芃 （中国人民大学物理系 教授）

时间：2016年1月12号 下午2:30

地点：理论物理研究所报告厅

Abstract:

For a mixture of alkali-earth atomic gas in the long-lived excited state 3P0 and ground state 1S0, in addition to nuclear spin, another “orbital” index is introduced to distinguish these two internal states. In this letter 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 scattering 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 173Yb 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.