Abstract
The warm-electron coefficient and mobility of the two-dimensional electron gas in a square quantum well (QW) of GaAs and As are studied over the temperature range 5 to 25 K. The effects of ionized-impurity, deformation-potential acoustic, and piezoelectric scattering are included in the framework of Fermi-Dirac statistics considering screening and nonequipartition of phonons. Scattering by alloy disorder is also included for As. The Ohmic mobility for GaAs and As QW’s is found to be controlled predominantly by ionized-impurity and alloy scatterings, respectively. The warm-electron coefficient is shown to be positive for a GaAs and negative for an As QW. Its magnitude decreases with increasing temperature and is larger for larger widths of the QW.
- Received 16 November 1990
DOI:https://doi.org/10.1103/PhysRevB.43.14638
©1991 American Physical Society