Abstract
We study theoretically phonon-induced spin dynamics of two electrons confined in a self-assembled double quantum dot. We calculate the transition rates and time evolution of occupations for the spin-triplet and spin-singlet states. We characterize the relative importance of various relaxation channels, including two-phonon processes, as a function of the electric and magnetic fields. The simulations are based on a model combining the eight-band varvec{k}!cdot !varvec{p} method and configuration-interaction approach. We show that the electron g-factor mismatch between the Zeeman doublets localized on different dots opens a relatively fast triplet-singlet phonon-assisted relaxation channel. We also demonstrate, that the relaxation near the triplet-singlet anticrossing is slowed down up to several orders of magnitude due to vanishing of some relaxation channels.
Highlights
We study theoretically phonon-induced spin dynamics of two electrons confined in a self-assembled double quantum dot
A system composed of two coupled quantum dots (QDs) offers an additional degree of freedom related to carrier localization, which can be controlled by an external electric field[16,17]
The singlet-triplet state manifold in an optically active QDM gives rise to a specific structure of optical transitions that can be exploited in quantum-optical s chemes[19,20] that are of both fundamental and application-oriented interest
Summary
We study theoretically phonon-induced spin dynamics of two electrons confined in a self-assembled double quantum dot. We discuss the kinetics of transition between the two-electron spin states and show that, depending on the magnetic field and temperature, various direct and sequential processes may contribute to the relaxation towards the singlet ground state. In section “Model”, we describe the model used to calculate the single and double electron states, as well as the phonon-assisted relaxation.
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