We have made the first observation of cyclotron resonance in In1-xMnxAs alloys. Our data unambiguously show that the effective mass of electrons systematically decreases with increasing Mn concentration x. Using an 8-band k·p method, we demonstrate that this mass reduction is a combined effect of (1) a decrease of the band gap and (2) an effective reduction of the momentum matrix element P due to the sp-d hybridization. We also observed a significant mass decrease with decreasing temperature, its temperature coefficient slightly depending on x. The temperature dependent sp-d-interaction-enhanced Landau level spin splitting cannot account for this unusual temperature dependence.
|Original language||English (US)|
|Number of pages||5|
|Journal||Physica E: Low-Dimensional Systems and Nanostructures|
|State||Published - May 1 2001|
- Cyclotron resonance
- Diluted magnetic semicondustors
- High magnetic fields