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Supplement of the Progress of theoretical physics

Population Dynamics for System of Exciton,Bi-Exciton and Photon (Selected Topics in Semiconductor Physics ) -- (High Excitation)

Eiichi Hanamura, Masahiro Inoue

Published Nov 29, 1975• 0 citations
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The study of time development is indispensable for a system of excitons and bi-excitons at high density because this exists only as a transient state. Here we study theoretically the population dynamics of excitons and bi·excitons both under the. pulse and steady excitations where photons and phonons emitted in the chemical processes of this system can be considered as the irrelevant external system. Under the opposite condition where the radiation field composes the relevant system, the laser action due to the radiative decay of bi ·excitons is discussed.
The study of time development is indispensable for a system of excitons and bi-excitons at high density because this exists only as a transient state. Here we study theoretically the population dynamics of excitons and bi-excitons both under the pulse and steady excitations where photons and phonons emitted in the chemical processes of this system can be considered as the irrelevant external system. Under the opposite condition where the radiation field composes the relevant system, the laser action due to the radiative decay of bi-excitons is discussed.
We have investigated the coherent transfer of excitonic populations in a semiconductor quantum dot (SQD) modulated by the surface plasmon of a metallic nanoparticle (MNP). The SQD is considered as a three-level V-type atomic system. We applied a transform-limited laser pulse field resonant with the upper atomic levels of the SQD. When the SQD is close enough to the MNP, the otherwise equally populated atomic levels can be selectively excited. Selectivity population can be achieved by two physical mechanisms: an enhancement of the Rabi frequencies that drive the optical transitions, which depends on the polarization arrangement, and a frequency shift of the optical transitions that leads to a dynamical detuning.