Abstract
Transport data near quantum Hall transitions are interpreted by identifying two distinct conduction regimes. The “classical” regime, dominated by nearest-neighbor hopping between localized conducting puddles, manifests an activatedlike resistivity formula, and the quantized Hall insulator behavior. At very low temperatures T, or farther from the critical point, a crossover occurs to a “quantum” transport regime dominated by variable range hopping. The latter is characterized by a different T dependence, yet the dependence on filling fraction is coincidentally hard to distinguish.
- Received 19 April 1999
DOI:https://doi.org/10.1103/PhysRevB.60.10691
©1999 American Physical Society