 111 oriented gas, a Algaras quantum wells show strong electric field dependence of conduction, electron spin relaxation, an isotropy due to interplay between Dresselhaus and Rashper spin splitting in C underscore 3V symmetry, which can be cancelled or inverted by varying the electric field applied perpendicular to QW plane. A spin density matrix model for conduction, band spin splitting is used to quantitatively describe the measured electric field dependence of spin relaxation, an isotropy, and predict an isotropic point, where the spin relaxation tensor reduces to a scalar, which is confirmed experimentally. The spin splitting compensation, electric field, and collision processes type in the QW, can also be directly extracted from the model without complementary measurements. This article was authored by a Balokai, T. Armand, G. Wang, and others.