Abstract
Anisotropic Hall mobilities of a two-dimensional electron gas are observed in modulation-doped heterostructures grown on a (001) GaAs vicinal substrate cut 2° toward the direction. The mobility is larger in the [] direction. There is no anisotropy in mobilities for a sample grown on a 2° vicinal substrate toward the direction. Electron scattering by an array of steps is proposed to account for the observed anisotropic Hall mobilities. The electron concentration dependence of mobility anisotropy implies that the origin of step potential is not interface roughness but localized dipole.
- Received 16 October 1995
DOI:https://doi.org/10.1103/PhysRevB.53.R10528
©1996 American Physical Society