Temperature dependence of vertical transport in quantum Hall multilayers
| Autor: | D. P. Druist, H. A. Walling, D. P. Dougherty, K. D. Maranowski, Elisabeth G. Gwinn, A. C. Gossard |
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| Rok vydání: | 2002 |
| Předmět: |
Physics
Condensed matter physics Quantum spin Hall effect Condensed Matter::Superconductivity Thermal Hall effect Edge states Quantum Hall effect Atmospheric temperature range Conductivity Condensed Matter Physics Lithography Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials |
| Zdroj: | Physica E: Low-dimensional Systems and Nanostructures. 12:132-135 |
| ISSN: | 1386-9477 |
| DOI: | 10.1016/s1386-9477(01)00285-5 |
| Popis: | We study the temperature dependence of vertical transport in GaAs/Al 0.1 Ga 0.9 As multilayers, in the regime of the integer quantum Hall effect. At low temperatures, vertical transport in quantum Hall states occurs on a two-dimensional chiral sheath of edge states near the sidewalls of the sample mesas. At higher temperatures, variable-range hopping through the bulk of the sample dominates. To extend the temperature range of sheath-dominated transport, we increase the device perimeters using fractal-shaped mesas defined by e-beam lithography. We report on the freeze-out of bulk transport and the nearly linear increase of the sheath conductivity with temperature. |
| Databáze: | OpenAIRE |
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