https://scholars.lib.ntu.edu.tw/handle/123456789/301233
標題: | On the equivalence between magnetic-field-induced phase transitions in the integer quantum Hall effect | 作者: | Huang, C.F. YUAN-HUEI CHANG Cheng, H.H. Yang, Z.P. Wang, S.Y. Yeh, H.D. Chou, H.T. Lee, C.P. Hwang, G.J. |
關鍵字: | D. Phase transitions; D. Quantum Hall effect; D. Scaling | 公開日期: | 2003 | 卷: | 126 | 期: | 4 | 起(迄)頁: | 197-201 | 來源出版物: | Solid State Communications | 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. © 2003 Elsevier Science Ltd. All rights reserved. |
URI: | http://www.scopus.com/inward/record.url?eid=2-s2.0-0037378304&partnerID=MN8TOARS http://scholars.lib.ntu.edu.tw/handle/123456789/301233 |
ISSN: | 00381098 | DOI: | 10.1016/S0038-1098(03)00100-5 | SDG/關鍵字: | Hall effect; Heterojunctions; Phase transitions; Quantum Hall effect; Magnetic field effects |
顯示於: | 物理學系 |
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