Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2004-04-10
Physica E 22, 232 (2004)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
11 pages, 3 figures
Scientific paper
10.1016/j.physe.2003.11.256
Plateau-plateau (P-P) and insulator-quantum Hall conductor (I-QH) transitions are observed in the two-dimensional electron system in an AlGaAs/GaAs heterostructure. At high fields, the critical conductivities are not of the expected universal values and the temperature-dependence of the width of the P-P transition does not follow the universal scaling. However, the semicircle law still holds, and universal scaling behavior was found in the P-P transition after mapping it to the I-QH transition by the Landau-level addition transformation. We pointed out that in order to get a correct critical exponent, it is essential that the scaling analysis must be performed near the critical point. And with proper analysis, we found that the P-P transition and the insulator quantum Hall conductor transitions are of the same universal class.
Chang Young-Hui
Cheng Hanqiang
Huang Chih-Fang
Hwang G. J.
~Liang C.-T.
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