Phys. Rev. Lett. 102, 216801 (2009) [4 pages]Scaling in Plateau-to-Plateau Transition: A Direct Connection of Quantum Hall Systems with the Anderson Localization ModelSee Also: Publisher's Note Received 19 December 2005; published 27 May 2009; publisher error corrected 8 June 2009 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 κ=0.42 was observed from 1.2 K down to 12 mK. This perfect scaling terminates sharply at a saturation temperature of Ts∼10 mK. The saturation is identified as a finite-size effect when the quantum phase coherence length (Lϕ∝T-p/2) reaches the sample size (W) of millimeter scale. From a size dependent study, Ts∝W-1 was observed and p=2 was obtained. The exponent of the localization length, determined directly from the measured κ and p, is ν=2.38, and the dynamic critical exponent z=1. © 2009 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.102.216801
DOI:
10.1103/PhysRevLett.102.216801
PACS:
73.43.Nq, 72.80.Ey, 73.40.Kp
See AlsoPublisher's Note: Wanli Li, C. L. Vicente, J. S. Xia, W. Pan, D. C. Tsui, L. N. Pfeiffer, and K. W. West, Publisher’s Note: Scaling in Plateau-to-Plateau Transition: A Direct Connection of Quantum Hall Systems with the Anderson Localization Model [Phys. Rev. Lett. 102, 216801 (2009)], Phys. Rev. Lett. 102, 249901 (2009). |
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