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 amplitude A amp versus δ 2 and γ 2. β = 3, γ 1 = 10, and δ 1 = 5 [−5], are given in panel (a) [(b)]. Accordingly, q = −3 [3] in panel (a) [b]. The oscillation is caused by a sudden change from γ 1 to γ 2 and δ 1 to δ 2. The dotted line marks the locations where (a), or (b). Thus this line marks the conditional maximum of in both panels (a) and (b), which is the largest value in each panel. The contours going away from this line are in an arithmetic series and decrease to zero. The black small circle marks the location where δ 2 = δ 1 and γ 2 = γ 1. The solid line passing through the circle marks the locations where and accordingly A amp = 0.