Probing Landau quantisation with the presence of insulator-quantum Hall transition in a GaAs two-dimensional electron system
arXiv:0802.1378 · doi:10.1088/0953-8984/20/29/295223
Abstract
Magneto-transport measurements are performed on the two-dimensional electron system (2DES) in an AlGaAs/GaAs heterostructure. By increasing the magnetic field perpendicular to the 2DES, magnetoresistivity oscillations due to Landau quantisation can be identified just near the direct insulator-quantum Hall (I-QH) transition. However, different mobilities are obtained from the oscillations and transition point. Our study shows that the direct I-QH transition does not always correspond to the onset of strong localisation.
11 pages, 7 figures