https://scholars.lib.ntu.edu.tw/handle/123456789/357179| Title: | Probing two-dimensional metallic-like and localization effects at low magnetic fields | Authors: | Huang, T.-Y. CHI-TE LIANG Kim, G.-H. Huang, C.F. Huang, C.-P. Ritchie, D.A. |
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. |
URI: | http://www.scopus.com/inward/record.url?eid=2-s2.0-76949092127&partnerID=MN8TOARS http://scholars.lib.ntu.edu.tw/handle/123456789/357179 |
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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