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HL: Fachverband Halbleiterphysik

HL 48: Poster 2

HL 48.59: Poster

Donnerstag, 26. März 2009, 15:00–17:30, P2

Theory of electron-phonon coupling in semiconductor quantum dots: non-diagonal coupling, phonon memory and initial correlations — •Marten Richter and Andreas Knorr — Institut für Theoretische Physik, AG Nichtlineare Optik und Quantenelektronik, Technische Universität Berlin, Hardenbergstraße 36 EW 7-1, 10623 Berlin

Memory effects play an important role in the theory of dephasing processes of semiconductor quantum dots. To describe strong electron-phonon coupling (e.g. in nitrid materials) beyond perturbation theory, typically methods such as generating functions, cumulant expansion, time convolution less theories (TCL) are used. These methods are usually restricted to a diagonal electron-phonon interaction, that does not include transitions between different electronic levels. Non-diagonal electron-phonon coupling is of dramatic importance, if coupled quantum dots or several levels contribute to the optical response. In order to address this problem, we present an extended TCL theory, which makes an inclusion of nondiagonal electron-phonon coupling to the calculation of the nonlinear optical response function possible.