標題: On the equivalence between magnetic-field-induced phase transitions in the integer quantum Hall effect
作者: Huang, CF
Chang, YH
Cheng, HH
Yang, ZP
Wang, SY
Yeh, HD
Chou, HT
Lee, CP
Hwang, GJ
電子工程學系及電子研究所
Department of Electronics Engineering and Institute of Electronics
關鍵字: phase transitions;quantum Hall effect;scaling
公開日期: 1-Apr-2003
摘要: 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. (C) 2003 Elsevier Science Ltd. All rights reserved.
URI: http://dx.doi.org/10.1016/S0038-1098(03)00100-5
http://hdl.handle.net/11536/28014
ISSN: 0038-1098
DOI: 10.1016/S0038-1098(03)00100-5
期刊: SOLID STATE COMMUNICATIONS
Volume: 126
Issue: 4
起始頁: 197
結束頁: 201
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