https://scholars.lib.ntu.edu.tw/handle/123456789/329026
標題: | An experimental study on Γ(2) modular symmetry in the quantum Hall system with a small spin splitting | 作者: | Huang, C.F. Cheng, H.H. Yang, Z.P. Yeh, H.D. Hsu, C.H. Hang, D.R. CHI-TE LIANG YUAN-HUEI CHANG HAO-HSIUNG LIN |
公開日期: | 2007 | 卷: | 19 | 期: | 2 | 來源出版物: | Journal of Physics Condensed Matter | 摘要: | Magnetic-field-induced phase transitions were studied with a two-dimensional electron AlGaAs/GaAs system. The temperature-driven flow diagram shows features of the Γ(2) modular symmetry, which includes distorted flowlines and a shifted critical point. The deviation of the critical conductivities is attributed to a small but resolved spin splitting, which reduces the symmetry in Landau quantization (Dolan 2000 Phys. Rev. B 62 10278). Universal scaling is found under the reduction of the modular symmetry. It is also shown that the Hall conductivity can still be governed by the scaling law when the semicircle law and the scaling on the longitudinal conductivity are invalid. © IOP Publishing Ltd. |
URI: | http://www.scopus.com/inward/record.url?eid=2-s2.0-33947599065&partnerID=MN8TOARS http://scholars.lib.ntu.edu.tw/handle/123456789/329026 |
DOI: | 10.1088/0953-8984/19/2/026205 | SDG/關鍵字: | Electric conductivity; Hall effect; Quantum theory; Semiconducting gallium arsenide; Spin dynamics; Landau quantization; Modular symmetry; Quantum Hall systems; Spin splitting; Crystal symmetry |
顯示於: | 物理學系 |
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