On the coexistence of localization and semiclassical transport in the low-field quantum Hall effect
Journal
Physica E: Low-Dimensional Systems and Nanostructures
Journal Volume
44
Journal Issue
7-8
Pages
1558-1561
Date Issued
2012
Author(s)
Hang, D.R.
Lin, L.-H.
Huang, C.F.
Huang, C.-Y.
Chen, J.C.
Tang, C.-C.
Chen, S.-F.
Lin, Y.-C.
Liu, C.-H.
Cheng, K.A.
Abstract
Magneto-transport measurements are performed on the two-dimensional electron system (2DES) in an AlGaAs/GaAs heterostructure. In the integer quantum Hall effect (IQHE) at low magnetic fields, the amplitudes of magneto-oscillations can follow the semiclassical Shubnikov-de Haas (SdH) formula even when the thermal activation is suppressed. Such oscillations, together with the finite resistance near SdH oscillation minima at low temperatures, reveal the insufficient localization in the low-field IQHE although the localization effect can still induce the mobility gap. © 2012 Elsevier B.V.
SDGs
Type
journal article