Exciton Spin Decay In Quantum Dots: Single And Double Phonon Assisted Transitions

摘要

We study phonon assisted transitions leading to exciton spin decay in quantum dots. We concentrate on couplings specific to the hole (Bir-Pikus Hamiltonian) and the exciton as a whole (short-range exchange interaction). A system strongly confined in a self-assembled quantum dot is considered.rnWe discuss single-phonon assisted processes arising from the interplay of these interactions and show the dominating role of transverse phonons. We have also found a new two-phonon assisted transition, connected with the interplay of different parts of the Bir-Pikus Hamiltonian in the presence of the singlet-triplet splitting.