Oscillation of the spin-currents of cold atoms on a ring due to light-induced spin–orbit coupling*
Xie Wen-Fanga), He Yan-Zhangb), Bao Cheng-Guangb)†
       
The frequency 1/ τp versus δ 2 and γ 2. The oscillation is caused by a sudden change in γ and δ . β = 3 and q = −3 are given. The values of the contours are in an arithmetic series. The contour closest to the right side has the largest value 1/ τp = 14.5.