noise in a dilute GaAs two-dimensional hole system in the insulating phase
| Autor: | Mohamed Henini, R. Leturcq, Christopher J. Mellor, G. Deville, D. L’Hôte, R. Tourbot |
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| Rok vydání: | 2006 |
| Předmět: |
Background noise
Materials science Condensed matter physics Electrical resistivity and conductivity Percolation Phase (matter) Heterojunction Metal–insulator transition Condensed Matter Physics Noise (electronics) Atomic and Molecular Physics and Optics Quantum well Electronic Optical and Magnetic Materials |
| Zdroj: | Physica E: Low-dimensional Systems and Nanostructures. 34:252-255 |
| ISSN: | 1386-9477 |
| Popis: | We have measured the resistance and the 1/f resistance noise of a two-dimensional low-density hole system in a high mobility GaAs quantum well at low temperature. At densities lower than the metal-insulator transition one, the temperature dependence of the resistance is either power-like or simply activated. The noise decreases when the temperature or the density increase. These results contradict the standard description of independent particles in the strong localization regime. On the contrary, they agree with the percolation picture suggested by higher density results. The physical nature of the system could be a mixture of a conducting and an insulating phase. We compare our results with those of composite thin films. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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