Regensburg 2007 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 12: Quantum dots and wires: Optical properties I

HL 12.9: Vortrag

Montag, 26. März 2007, 17:00–17:15, H17

Dephasing of the Nonlinear Optical Spin Dynamics in Doped Semiconductor Quantum Dots — •Carsten Weber¹, Anna Grodecka^1,2, Paweł Machnikowski², and Andreas Knorr¹ — ¹Institut für Theoretische Physik, Nichtlineare Optik und Quantenelektronik, Technische Universität Berlin, Hardenbergstr. 36, 10623 Berlin — ²Institute of Physics, Wrocław University of Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland

An understanding of the dephasing processes of the states involved in spin optical control schemes is essential for applications in quantum information theory and spintronics. We study the phonon-induced decoherence effects on the nonlinear dynamics and pump-probe spectra of a doped semiconductor quantum dot used for optical control of a spin, using density-matrix theory. While the consideration of the Coulomb coupling is exact, the electron-phonon interaction is treated perturbatively for low temperatures. The mediation between the two electronic spin states is achieved via the excitation of a trion state which interacts with the environment.