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Very recently, the electric dipole spin resonance (EDSR) of single electronsin quantum dots was discovered by three independent experimental groups.Remarkably, these observations revealed three different mechanisms of EDSR:coupling of electron spin to its momentum (spin-orbit), to the operator of itsposition (inhomogeneous Zeeman coupling), and to the hyperfine Overhauser fieldof nuclear spins. In this paper, I present a unified microscopic theory ofthese resonances in quantum dots. A mean field theory, derived for all threemechanisms and based on retaining only two-spin correlators, justifies applyingmacroscopic description of nuclear polarization to the EDSR theory. In theframework of the mean field theory, a fundamental difference in the timedependence of EDSR inherent of these mechanisms is revealed; it changes fromthe Rabi-type oscillations to a nearly monotonic growth. The theory provides aregular procedure to account for the higher nuclear-spin correlators thatbecome of importance for a wider time span and can change the asymptoticbehavior of EDSR. It also allows revealing the effect of electron spin dynamicson the effective coupling between nuclear spins.

Theory of electric dipole spin resonance in quantum dots: Mean field theory with Gaussian fluctuations and beyond