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On the equivalence between magnetic-field-induced phase transitions in the integer quantum Hall effect |
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| Authors: | C.F. Huang Y.H. ChangH.H. Cheng Z.P. YangS.Y. Wang H.D. Yeh H.T. ChouC.P. Lee G.J. Hwang |
| Affiliation: | a Department of Physics, National Taiwan University, Taipei 106, Taiwan, ROC b National Measurement Laboratory, Center for Measurement Standards, Industrial Technology Research Institute, Bldg 16, 321 Kuang Fu Road, Section 2, Hsinchu 300, Taiwan, ROC c Center for Condensed Matter Sciences, National Taiwan University, Taipei 106, Taiwan, ROC d Department of Electronics Engineering, National Chiao Tung University, Hsinchu 300, Taiwan, ROC |
| Abstract: | Magnetic-field-induced phase transitions in the two-dimensional electron system in a AlGaAs/InGaAs/GaAs heterostructure are studied. Two kinds of magnetic-field-induced phase transitions, plateau-plateau (P-P) and insulator-quantum Hall conductor (I-QH) transitions, are observed in the integer quantum Hall effect regime at high magnetic fields. In the P-P transition, both the semicircle law and the universality of critical conductivities are broken and we do not observe the universal scaling. However, the P-P transition can still be mapped to the I-QH transition by the Landau-level addition transformation, and as the temperature decreases the critical points of these two transitions appear at the same temperature. Our observations indicate that the equivalence between P-P and I-QH transitions can be found by the suitable analysis even when some expected universal properties are invalid. |
| Keywords: | 73.40 Hm |
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