Figure 2: FQH effect in the zeroth LL.
(a) ρxx(v) between v=0 and v=1 at 25 T (red), 35 T (purple) and 45 T (blue). At 45 T, FQH states with denominator 9 are noticeable. σxy (black curve) shows well-defined plateaus at 2/3, 3/5 and 4/7. At lower filling factors, mixing with ρxx makes the plateaus indistinct. (b) ρxx(v) between v=1 and v=2 for B ranging from 17 to 25 T. FQH states are visible at 5/3 and 7/5, not just even-numerator fractions. σxy (black curve) at 17 T. (c) Arrhenius plots for v=1/3, 2/3, 4/3 and 5/3, showing activated behaviour.
