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J Phys Condens Matter. 2012 Oct 10;24(40):405601. doi: 10.1088/0953-8984/24/40/405601. Epub 2012 Sep 12.

Insulator, semiclassical oscillations and quantum Hall liquids at low magnetic fields.

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  • 1Graduate Institute of Applied Physics, National Taiwan University, Taipei 106, Taiwan.


Magneto-transport measurements are performed on two-dimensional GaAs electron systems to probe the quantum Hall (QH) effect at low magnetic fields. Oscillations following the Shubnikov-de Haas (SdH) formula are observed in the transition from the insulator to QH liquid when the observed almost temperature-independent Hall slope indicates insignificant interaction correction. Our study shows that the existence of SdH oscillations in such a transition can be understood based on the non-interacting model.

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