Abstract
We have realized an AlAs two-dimensional electron system in which electrons occupy conduction-band valleys with different Fermi contours and effective masses. In the quantum Hall regime, we observe both resistivity spikes and persistent gaps at crossings between the Landau levels originating from these two valleys. From the positions of the spikes in tilted magnetic fields and measurements of the energy gaps away from the crossings, we find that, after occupation of the minority valley, the spin susceptibility drops rapidly, and the electrons possess a single interaction-enhanced g-factor, despite the dissimilarity of the two occupied valleys.
Original language | English (US) |
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Pages (from-to) | 285-288 |
Number of pages | 4 |
Journal | Solid State Communications |
Volume | 140 |
Issue number | 6 |
DOIs | |
State | Published - Nov 2006 |
All Science Journal Classification (ASJC) codes
- General Chemistry
- Condensed Matter Physics
- Materials Chemistry
Keywords
- A. Quantum wells
- D. Electron-electron interactions
- D. Electronic transport
- D. Quantum Hall effect