Quantum Hall ferromagnetism of AlAs 2D electrons
| Autor: | Werner Dietsche, M. Lynass, M. Hauser, J.G.S. Lok, K. von Klitzing |
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| Rok vydání: | 2004 |
| Předmět: |
Physics
Condensed matter physics Quantum spin Hall effect Exchange interaction Composite fermion Quantum point contact Fractional quantum Hall effect Thermal Hall effect Landau quantization Quantum Hall effect Condensed Matter Physics Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials |
| Zdroj: | Physica E: Low-dimensional Systems and Nanostructures. 22:94-97 |
| ISSN: | 1386-9477 |
| DOI: | 10.1016/j.physe.2003.11.224 |
| Popis: | We present magneto-transport measurements in tilted magnetic fields on high mobility (μ=300.000 cm 2 / V s ) AlAs two-dimensional electron systems. Our samples show integer and fractional quantum Hall effects. In titled magnetic fields, at the crossings of Landau levels with opposite spin, the resistance shows a spike if the crossing occurs near integer filling or is significantly enhanced otherwise. The position of the spike displays a hysteresis below 350 mK that reaches more than 0.1 T at 20 mK . From the position of the crossing in the (Btot,Bperp)-plane the difference in exchange energy of the crossing levels is determined and found to be a non-linear function of the perpendicular magnetic field. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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