Probing the plateau-insulator quantum phase transition in the quantum hall regime

摘要: We report quantum Hall experiments on the plateau-insulator transition in a low mobility $In_{.53}$ $Ga_{.47}$ $As/InP$ heterostructure. The data for longitudinal resistance $\rho_{xx}$ follow an exponential law and we extract critical exponent $\kappa= .55 \pm .05$ which is slightly different from established value $\kappa = .42 .04$ plateau transitions. Upon correction inhomogeneity effects, cause conductance $\sigma_{xx}^*$ to depend marginally temperature, our indicate that plateau-plateau plateau- insulator transitions are same universality class.