title: Scaling in plateau-to-plateau transition: a direct connection of quantum hall systems with the Anderson localization model.
abstract: The quantum Hall-plateau transition was studied at temperatures down to 1 mK in a random alloy disordered high mobility two-dimensional electron gas. A perfect power-law scaling with kappa=0.42 was observed from 1.2 K down to 12 mK. This perfect scaling terminates sharply at a saturation temperature of Ts approximately 10 mK. The saturation is identified as a finite-size effect when the quantum phase coherence length (Lphi proportional, T(-p/2)) reaches the sample size (W) of millimeter scale. From a size dependent study, Ts proportional, W(-1) was observed and p=2 was obtained. The exponent of the localization length, determined directly from the measured kappa and p, is nu=2.38, and the dynamic critical exponent z=1.
authors.affiliation: Princeton University, Princeton, New Jersey 08544, USA. sciwanli@gmail.com
authors.forename: Wanli
authors.initials: W
authors.lastname: Li
authors.forename: C L
authors.initials: CL
authors.lastname: Vicente
authors.forename: J S
authors.initials: JS
authors.lastname: Xia
authors.forename: W
authors.initials: W
authors.lastname: Pan
authors.forename: D C
authors.initials: DC
authors.lastname: Tsui
authors.forename: L N
authors.initials: LN
authors.lastname: Pfeiffer
authors.forename: K W
authors.initials: KW
authors.lastname: West