The mean photon number 〈a†a〉 under different driving ways. Panels (a) and (c) correspond to driving the cavity, 〈a†a〉 of driving the atoms is shown in panels (b) and (d). The solid lines and dashed lines in both panels (a) and (b) are Δϕ = 2nπ and Δϕ = (2n+1)π, respectively. The solid lines and the dashed lines in panels (b) and (d) correspond to Δϕ = (1/3+2n)π and Δϕ = (2/3+2n)π, respectively. The normalized parameters, η_c/κ = 0.5, η_a/κ = 0.5, γ/κ = 1.0, and G/κ = g₁/κ = 15 are taken. The diagrams of relative atom’s position in cavity are shown in the top of the figure.