Spin Coherence Control by Pulsed Magnetic Fields

A novel approach is discussed to control the electron spin coherence in semiconductor structures. We show that a pulsed magnetic field can be used to suppress the electron spin relaxation due to the spatial asymmetry of the system. The spin relaxation time is calculated as a function of the magnetic field profile and magnitude within a Monte Carlo simulation scheme. We report an oscillatory dependence of the spin relaxation time on magnitude/width of the pulses with a maximum corresponding to the pi-pulse. It is important that the spin relaxation can be efficiently suppressed even using relatively narrow or distant pulses.