Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2006-09-13
Journal of Physics: Condensed Matter 19, 026205 (2007)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
The revised manuscript has been published in J. Phys.: Condens. Matter
Scientific paper
10.1088/0953-8984/19/2/026205
Magnetic-field-induced phase transitions were studied with a two-dimensional electron AlGaAs/GaAs system. The temperature-driven flow diagram shows the features of the $\Gamma$(2) modular symmetry, which includes distorted flowlines and shiftted critical point. The deviation of the critical conductivities is attributed to a small but resolved spin splitting, which reduces the symmetry in Landau quantization. [B. P. Dolan, Phys. Rev. B 62, 10278.] Universal scaling is found under the reduction of the modular symmetry. It is also shown that the Hall conductivity could still be governed by the scaling law when the semicircle law and the scaling on the longitudinal conductivity are invalid. *corresponding author:yhchang@phys.ntu.edu.tw
Chang Young-Hui
Cheng Hanqiang
Hang D. R.
Hsu Chun-Hao
Huang Chih-Fang
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