Non-Markovianity of a qubit coupled with an isotropic Lipkin–Meshkov–Glick bath
Tian Li-Jun, Ti Min-Min, Zhai Xiang-Dong
       
The oscillatory behaviors of amplitude function in different phases. (a) λ = 0.4, λ′ = 0.5, N = 500 (solid line), N = 1000 (dashed line). (b) λ = 1.2, λ′ = 0.2, N = 100 (solid line), N = 200 (dashed line).