Non-Markovianity of a qubit coupled with an isotropic Lipkin–Meshkov–Glick bath
Tian Li-Jun, Ti Min-Min, Zhai Xiang-Dong
       
Setting N = 500, the non-Markovianity versus λ′ are plotted in panels (a) and (b) with different λ : (a) λ = 0.1, 0.5, and 0.8; (b) λ = 1.1, 1.5, and 1.8.