Exciton spin decay in quantum dots : single and double phonon assisted transitions

Titelangaben

Roszak, Katarzyna ; Machnikowski, Paweł ; Axt, Vollrath Martin ; Kuhn, Tilmann:
Exciton spin decay in quantum dots : single and double phonon assisted transitions.
In: Physica Status Solidi C. Bd. 6 (2009) Heft 2 . - S. 537-541.
ISSN 1610-1642
DOI: https://doi.org/10.1002/pssc.200880325

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Abstract

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.We 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.