Scaling and Universality of Integer Quantum Hall Plateau-to-Plateau Transitions

摘要

We have investigated the integer quantum Hall plateau-to-plateau transition in two-dimensional electrons confined to Al_xGa_(1-x)As-Al_(0.33)Ga_(067)As heterostructures over a broad range of Al concentration x. For x between 0.65% and 1.6%, where the dominant contribution to disorder is from the short-range alloy potential fluctuations, we observe a perfect power-law scaling in the temperature range from 30 mK to 1 K with a critical exponent K = 0.42 ± 0.01.