Abstract
We have studied the physical processes responsible for the spin-flip in GaAs quantum dots. We have calculated the rates for different mechanisms which are related to spin–orbit coupling and cause a spin-flip during the inelastic relaxation of the electron both with and without a magnetic field. It is generally observed that the corresponding spin-flip rates are by several orders of magnitude lower than those for the spin-flip processes for free 2D electrons (i.e. in the case when there is no confinement in the plane). We have shown that it is due to the zero-dimensional character of the problem (electron wave functions are localized in all directions) which leads to freezing out of the most effective spin-flip mechanisms related to the absence of the inversion centers in the elementary crystal cell and on the heterointerface.
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