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

Shun-Tsung Lo, Yi-Ting Wang, G Bohra, E Comfort, T-Y Lin, M-G Kang, G Strasser, J P Bird, C F Huang, Li-Hung Lin, J C Chen, C-T Liang

Published 2012-09-13Version 1

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.