Figure 3: Magnetic field dependence of Hall plateaus.

(a,b) σ_xy at T=40 mK under various B as a function of effective gate voltage V_G−V_CNP for the x=0.84 (a) and x=0.88 (b) films. Traces for lower magnetic fields are each vertically offset by e²/h. Dotted lines represent the plateau transitions as defined at σ_xy=±0.5 e²/h. (c,d) Quantized σ_xy phase diagram for the ν=+1, 0 and −1 (blue, green and red shaded, respectively) states associated with the plateau edges (filled squares) and the plateau transition point (filled circles) defined at σ_xy=±0.5 e²/h in the plane of magnetic field and V_G−V_CNP. The plateau edges are determined by the second-order V_G derivative of σ_xy.