ELECTRICALLY TUNABLE "RENORMALIZATION" OF s-d EXCHANGE INTERACTION IN A DILUTED MAGNETIC SEMICONDUCTOR QUANTUM DOT

We theoretically demonstrate that how the Rashba spin-orbit interaction induced by the external electric field can be used to manipulate spin degree of freedom of electrons in a diluted magnetic semiconductor quantum dot (DMS QD) in the presence of a weak perpendicular magnetic field. The effects of Rashba spin-orbit interaction, induced by the electrostatic potential, on the apparent total spin splitting in a diluted magnetic semiconductor quantum dot have been studied. We propose that the apparent total spin splitting is the result of electrically tunable "renormalization" of s-d exchange interaction. It could be favorably engineered to electrically tune the spin degree of freedom in the spintronic devices.