Extended Data Fig. 6: Colour map of σ_xx in the parameter space of μ₀H_z and V_g at T = 0.2 K with increasing μ₀H_x.

The measurements were conducted by fixing μ₀H_x and sweeping V_g with μ₀H_z varied from +2.5 T to −1.5 T. As μ₀H_x increases, the QAH region indicated by blue colour is enlarged and the sudden gap increase at μ₀H_z ≈ 2.2 T becomes smoother. When μ₀H_x is increased to 2 T, the AFM to SSF transition nearly disappears.