Theory of spin splitting in Ga1-xAlxAs parabolic quantum wells controlled by an electric field -: art. no. 035325

The five-level k(.)p model for Ga1-xAlxAs parabolic quantum wells, characterized by the continuously varying chemical composition x, is used to calculate the effective spin g(*) factor of conduction electrons. The theory with no adjustable parameters agrees well with the experimental data of Salis [Nature 414, 619 (2001)]. Both negative and positive spin g(*) values are described, as well as their dependence on an external electric field. The Bychkov-Rashba spin splitting due to inversion asymmetry of the structures caused by electric bias is calculated and shown to give negligible contribution to the g(*) values.