On the equivalence between magnetic-field-induced phase transitions in the integer quantum Hall effect

被引:7
作者
Huang, CF
Chang, YH
Cheng, HH
Yang, ZP
Wang, SY
Yeh, HD
Chou, HT
Lee, CP
Hwang, GJ
机构
[1] Ind Technol Res Inst, Ctr Measurement Stand, Natl Measurement Lab, Hsinchu 300, Taiwan
[2] Natl Taiwan Univ, Dept Phys, Taipei, Taiwan
[3] Natl Taiwan Univ, Ctr Condensed Matter Sci, Taipei 106, Taiwan
[4] Natl Chiao Tung Univ, Dept Elect Engn, Hsinchu 300, Taiwan
关键词
phase transitions; quantum Hall effect; scaling;
D O I
10.1016/S0038-1098(03)00100-5
中图分类号
O469 [凝聚态物理学];
学科分类号
070205 ;
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.
引用
收藏
页码:197 / 201
页数:5
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