Abstract
Tilted field magnetotransport study was performed in a two-valley strained Si quantum well and hysteretic diagonal resistance spikes were observed near the coincidence angles. The spike around filling factor ν = 3 develops into a giant feature when it moves to the high-field edge of the quantum Hall (QH) state and quenches for higher tilt angles. When the spike is most prominent, its peak resistance is temperature independent from T∼20 mK up to 0.3 K, which is different from the critical behavior previously reported near the Curie temperature of the QH ferromagnet in AlAs quantum wells. Our data suggest a strong interplay between spins and valleys near the coincidence.
Original language | English (US) |
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Pages (from-to) | 176-178 |
Number of pages | 3 |
Journal | Physica E: Low-Dimensional Systems and Nanostructures |
Volume | 34 |
Issue number | 1-2 |
DOIs | |
State | Published - Aug 2006 |
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Atomic and Molecular Physics, and Optics
- Condensed Matter Physics
Keywords
- Quantum Hall ferromagnetism
- Si quantum well
- Valley degeneracy