Přednášející: Karel Král (oddělení teorie kondenzovaných látek, FZÚ AV ČR, v.v.i.)
Místo: Na Slovance, přednáškový sál v přízemí
Pořadatelé: Oddělení teorie kondenzovaných látek
Jazyk přednášky: anglicky
One of the remarkable experimental characteristics of the so called blinking of the quantum dots is their power law distribution of the lengths of the on (off) periods during which the photoluminescence is on (off).
The power law time characteristics do not seem to be rare in the zero-dimensional systems. The luminescence response of certain quantum dot systems to a short laser pulse has been experimentally found to be a slow process, developing in time as a power-law dependence, in contrast to the most usually expected exponential decay. In the presentation the attention will be payed to this particular effect and we bring theoretical arguments in favor of the interpretation that the power-law decay can be an implication of a single-dot property. We use a certain rather realistic model for this purpose. The model consists of a single quantum dot with the electron-LO-phonon interaction, which is included as a non-adiabatic influence of the atomic lattice motion on the electrons inside the quantum dot. The quantum dot is nevertheless a part of a quantum dot sample. The relation of the present model of the quantum dot kinetics to the real systems observed in experiments is discussed. The properties of the system are analyzed numerically.
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