Extended Data Fig. 9: Chern number tuned by varying the Cr doping level in magnetic TI layers.
From: Tuning the Chern number in quantum anomalous Hall insulators
a–d, Dependence of ρxx (red) and ρyx (blue) on μ0H for the m = 2 sample, with different Cr doping levels x. All measurements were taken at the charge-neutral point (Vg = Vg,0) and T = 25 mK. ρyx(0) displays the quantized values of 0.969h/e2, 0.994h/e2, 0.498h/e2 and 0.497h/e2 for the samples with x = 0.13, 0.15, 0.24 and 0.35, respectively. The corresponding ρxx(0) value are 0.078h/e2, 0.002h/e2, 0.008h/e2 and 0.010h/e2. e–h, Dependence of ρyx(0) (blue squares) and ρxx(0) (red circles) on gate voltage (Vg − Vg,0) for x = 0.13, 0.15, 0.24 and 0.35. All measurements were taken at T = 25 mK and μ0H = 0 T after magnetic training.
