Non-equilibrium behaviour of spin-resolved quantum transport in tilted magnetic fields
| Autor: | P Streda, M. Cukr, C. Breitlow, P. Svoboda, G. Nachtwei, S. Heide |
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| Rok vydání: | 1996 |
| Předmět: |
Condensed matter physics
Magnetoresistance Scattering Chemistry Quantum Hall effect Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Condensed Matter Physics Shubnikov–de Haas effect Electronic Optical and Magnetic Materials Magnetic field Materials Chemistry Electrical and Electronic Engineering Diffusion (business) Quantum Spin-½ |
| Zdroj: | Semiconductor Science and Technology. 11:1015-1021 |
| ISSN: | 1361-6641 0268-1242 |
| DOI: | 10.1088/0268-1242/11/7/007 |
| Popis: | We investigate the coupling between edge and bulk states in GaAs/GaAlAs quantum Hall conductors with different lateral geometry by analysing the non-ohmic magnetoresistance in quantizing magnetic fields. By tilting the 2DES of the sample in situ with respect to the magnetic field direction, the spin splitting energy is changed with respect to the cyclotron energy. The resulting change of the spatial separation between edge and bulk channels is detected experimentally by changes of the corresponding Shubnikov - de Haas (SdH) peak heights and their current dependences which allows us to evaluate the equilibration length characterizing the edge-to-bulk scattering. The angular dependences of obtained experimentally for the different uppermost bulk quantum levels are compared with model calculations using different assumptions concerning the shape of the confining potential and the dominant scattering process. The assumption of a parabolic confinement potential cannot explain the experimental data consistently for all filling factors. In contrast, a good agreement of measured and calculated data can be obtained within the recently developed picture of alternating compressible and incompressible strips near the sample edge. The data suggest a dominance of single scattering events at short-range scatterers. |
| Databáze: | OpenAIRE |
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