The influence of the initially atomic state on the atomic squeezing dynamics in the Markovian regime (λ = 5γ₀). (a) The dynamics revolution of the squeezing factor F₂ as functions of φ and γ₀t when θ = π/4. (b) The dynamics revolution of the squeezing factor F₂ as functions of θ and γ₀t when φ = 0. Other parameters are Ω = γ₀ and ω₀ = 20γ₀.