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 magnetization Pz versus τ observed at θ = 0 for the case that the initial state is a superposition state with a ϕ marked by the curve. q = 3, β = 2, γ = 15, and δ = 20 are assumed. When ϕ = π or 0 the oscillation is harmonic. Otherwise, it is not.