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We study theoretically phonon-induced spin dynamics of two electrons confinedin a self-assembled double quantum dot. We calculate the transition rates andtime evolution of occupations for the spin-triplet and spin-singlet states. Wecharacterize the relative importance of various relaxation channels as afunction of the electric and magnetic fields. The simulations are based on amodel combining the eight-band k.p method and configuration-interactionapproach. We show that the electron g-factor mismatch between the Zeemandoublets localized on different dots opens a relatively fast triplet-singletrelaxation channel. We also demonstrate, that the relaxation near thetriplet-singlet anticrossing is slowed down up to several orders of magnitudedue to vanishing of some relaxation channels.

Phonon-assisted relaxation between triplet and singlet states in a self-assembled double quantum dot