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HL: Fachverband Halbleiterphysik

HL 16: Ultrafast Phenoma II

HL 16.4: Vortrag

Montag, 20. März 2017, 15:45–16:00, POT 51

Quantum descriptions of spatio-temporal dynamics in carrier-capture processes: comparison between approaches — •Roberto Rosati, Doris E. Reiter, and Tilmann Kuhn — Institut für Festkörpertheorie, Universität Münster, Wilhelm-Klemm-Str. 10, 48149 Münster

Due to the ultrashort spatial and temporal scales involved, carrier capture processes in nanostructures are genuine quantum processes. While a density matrix-based quantum kinetik (QK) approach has been successfully applied to describe phonon-induced carrier capture from a GaAs quantum wire into an embedded quantum dot [1], due to the numerical complexity extensions of this approach to higher dimensional systems, to longer times and to phenomena involving different interaction mechanisms remain difficult. By properly tailoring a recently proposed nonlinear density matrix equation based on a Lindblad superoperator [2], here we present an approach which, thanks to additional approximations, is computationally less demanding and inherently stable. By comparing the two approaches we show that the essential features of the capture dynamics are well reproduced by the Lindblad-based approach.

[1] Glanemann et al., Phys. Rev. B 72, 045354 (2005)

[2] Rosati et al., Phys. Rev. B 90, 125140 (2014)