On the coexistence of localization and semiclassical transport in the low-field quantum Hall effect

K.Y Chen,C.-T Liang,D.R Hang,Li-Hung Lin,C.F Huang,Y.H Chang,Chih-Ying Huang,J.C Chen,Chiu-Chun Tang,Shih-Fang Chen,Yu-Chuan Lin,Cheng-Hua Liu,K.A Cheng

doi:10.1016/j.physe.2012.03.027

On the coexistence of localization and semiclassical transport in the low-field quantum Hall effect

K.Y Chen, C.-T Liang + Show 11 more

https://doi.org/10.1016/j.physe.2012.03.027

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Journal: Physica E: Low-dimensional Systems and Nanostructures	Publication Date: Apr 1, 2012
Citations: 4

Affiliation: Industrial Technology Research Institute, National Taiwan University, Lunghwa University of Science and Technology, National Tsing Hua University, National Chiayi University, National Sun Yat-sen University

#Low Fields #Coexistence Of Localization + Show 8 more

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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.

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