Regensburg 2013 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 3: Focus Session: Electron-phonon interaction and ultrafast processes in semiconductors

HL 3.9: Vortrag

Montag, 11. März 2013, 13:45–14:00, H13

Theory of optical emission in semiconductor nanostructures - selforganized, colloidal quantum dots and quantum wells — •Marten Richter, Uyen-Khanh Dang, Julia Kabuss, Alexander Carmele, Mario Schoth, Matthias-Rene Dachner, and Andreas Knorr — Institut für Theoretische Physik, Nichtlineare Optik und Quantenelektronik, Technische Universität Berlin, Germany

The coupling of electrons and phonons in semiconductor nanostructures shows a strong impact on their quantum dynamics. In this talk, we discuss the electron–phonon assisted optical emission of quantum dots and quantum wells. We start with an analysis of the influence of acoustical and optical phonons on the fluorescence and Raman signals of selforganized quantum dots. In particular, frequency and time resolved spectra are analyzed. For quantum well intersubband transitions, longitudinal phonons cause inter- and intrasubband relaxation. We discuss these processes and their visibility in 2D coherent spectra. At the end, we give an outlook to the electron–phonon interaction in colloidal quantum dots compared to selforganized quantum dots, with a focus on the process of carrier multiplication.