Berlin 2005 – wissenschaftliches Programm

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HL: Halbleiterphysik

HL 58: Poster IIb

HL 58.19: Poster

Dienstag, 8. März 2005, 16:30–19:00, Poster TU F

Resonance Fluorescence of Semiconductor Quantum Dots: Signatures of the Electron-Phonon Interaction — •Kwang Jun Ahn, Jens Förstner, and Andreas Knorr — Institut für Theoretische Physik, AG Nichtlineare Optik und Quantenelektronik, Technische Universität Berlin, Hardenbergstr.36 PN7-1, 10623 Berlin

Compared to an atom in vacuum, which is considered as an isolated quantum optical system, excitons in semiconductor quantum dots are embedded in a complex solid state environment and interact with phonons. We investigate the influence of acoustic phonons on incoherent photon emission. The equations of motion of the density matrix are derived for the coupled system of quantum dot electrons, phonons and photons using the correlation expansion up to second order. The corresponding resonance fluorescence spectra are calculated depending on pulse duration and temperature. The appearance of sideband broadening by electron-phonon interaction in the spectrum depends on the pulse duration compared to the typical electron-phonon scattering time. In addition, non-classical signatures of the emitted light are discussed.