|Title:||Probing two-dimensional metallic-like and localization effects at low magnetic fields||Authors:||Huang, T.-Y.
|Keywords:||Insulator-quantum Hall transition; Metallic; Shubnikov-de Haas||Issue Date:||2010||Journal Volume:||42||Journal Issue:||4||Start page/Pages:||1142-1144||Source:||Physica E: Low-Dimensional Systems and Nanostructures||Abstract:||
The metallic-like regime characterized by Shubnikov-de Haas (SdH) oscillations is investigated between localization-induced weak insulator and quantum Hall liquid in a gated two-dimensional GaAs electron system containing InAs dots. Multiple SdH crossing points are observed in the longitudinal resistivity before the appearance of the critical point of a plateau transition with increasing perpendicular magnetic field. In conductivities, however, there is no corresponding crossing in the metallic-like regime because of the T-dependent Hall slope under electron-electron interaction, which provides an explicit way to distinguish SdH crossing points from the critical point in our study. © 2009 Elsevier B.V. All rights reserved.
|ISSN:||13869477||DOI:||10.1016/j.physe.2009.11.049||SDG/Keyword:||Critical points; Crossing point; Electron systems; GaAs; InAs; Localization effect; Longitudinal resistivity; Low magnetic fields; Perpendicular magnetic fields; Quantum hall; Quantum hall liquids; Shubnikov-de Haas; Electron-electron interactions; Equations of state; Magnetic fields; Semiconducting organic compounds; Two dimensional; Electrons|
|Appears in Collections:||物理學系|
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