The magnitude of quasi energy πT , 0 gap, at high symmetric point k = 0, k = π as a function of driving frequency. Parameters are fixed the same as those in Fig. 1(a) except for μ₀, μ₁: (a) μ₀ = 3, μ₁ = 4. (b) μ₀ = 5, μ₁ = 4. (c) μ₀ = 3, μ₁ = 10. (d) μ₀ = 5, μ₁ = 10.