Abstract
Interesting ferromagnetic characteristics are found in quantum Hall effects when Landau levels (LLs) cross and carrier interaction effects become important at the crossing points. Such LL crossings are studied in bilayer AlGaAs/GaAs systems and silicon quantum wells having a novel valley splitting. Detailed measurements of bilayer ferromagnetism at the LL crossings reveal easy-plane or axis characteristics depending on spin and pseudospin of the crossing states. In the fractional QH regime, interactions between electron and nuclear spins are observed at the crossings of composite-fermion LLs.
Original language | English |
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Pages (from-to) | 133-142 |
Number of pages | 10 |
Journal | Physica E: Low-Dimensional Systems and Nanostructures |
Volume | 20 |
Issue number | 1-2 |
DOIs | |
Publication status | Published - 2003 Dec |
Externally published | Yes |
Event | Proceedings of the International Symposium at Quantum Hall Effect - Stuttgart, Germany Duration: 2003 Jul 2 → 2003 Jul 5 |
Keywords
- Composite fermion
- Electron spin
- Landau level
- Nuclear spin
- Quantum Hall effect
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Atomic and Molecular Physics, and Optics
- Condensed Matter Physics