Fig. 2.

Quantum Hall effect observed in Cd₃As₂ films. a, b High-field magnetotransport for thin films (t = 12 and 14 nm) measured at T = 1.4 K. The numbers of the horizontal bars represent the filling factor ν. The degeneracy factor s is determined to be s = 2 from the increment of the plateau values. c, d Same scan for slightly thicker films (t = 16 and 23 nm). By contrast, the degeneracy factor is altered to s = 1 in these thicker films at high fields. Inset depicts a measured Hall bar with a channel width of 60 μm. The length of the scale bar is 300 μm