Experimental studies of scaling behavior of a quantum Hall system with a tunable Landau level mixing

Temperature dependence of the longitudinal and Hall resistances is studied in the regime of localization-delocalization transition. We carry out measurements of scaling exponent kappa in the Landau level mixing region at several filling factors. The localization exponent gamma is extracted using an approach based on the variable-range hopping theory. The values of gamma and kappa are found to be universal and independent of the filling factor in our sample. We can conclude that although Landau level mixing can change the degeneracy of a quantum Hall state, the value of the scaling exponent remains the same for a given sample that contains a fixed disorder profile.