Abstract
Electron spin resonance (ESR) was studied in an asymmetrically doped 16-nm AlAs quantum well grown in the [001] direction. Surprisingly the ESR was detectable even if the magnetic field was parallel to the surface of the two-dimensional system. This allowed us to investigate precisely the in-plane anisotropy of the electron factor. In the case of the magnetic field aligned along the [110] or crystallographic axes only one ESR peak was observed, whereas it tended to split into two well-separated peaks when the in-plane component of the magnetic field was between these directions. This fact clearly indicates that two in-plane valleys at points of the Brillouin zone were occupied with electrons and each valley was characterized by the anisotropic factor with the [100], [010], and [001] principal axes. The principal -factor values were extracted.
- Received 4 August 2015
DOI:https://doi.org/10.1103/PhysRevB.92.161301
©2015 American Physical Society