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Sonderforschungsbereich 631 Festkörperbasierte Quanteninformationsverarbeitung SEMINARANKÜNDIGUNG Dienstag, 20. Januar 2009 17:15 Uhr WSI, Seminarraum S 101 “Coherent optical control of semiconductor quantum dots” Self-assembled quantum dots are nanoscale volumes of InGaAs embedded in a GaAs matrix. The dot provides electronic confinement in all three spatial dimensions, resulting in a set of discrete energy levels energetically isolated from their solid-state environment. This results in an atom-like coherent light-matter interaction, where key signatures such as Rabi oscillations, Ramsey interference and AutlerTownes splittings have been reported. In this seminar, I will discuss our recent work on the coherent optical manipulation of the excitonic and spin states of a single semiconductor quantum dot using sequences of picosecond laser pulses and a photocurrent detection technique. The main topics of the talk will be: (1) A demonstration of a scheme to prepare and detect a single hole spin, and progress towards the optical control of a single hole spin. (2) The vacuum-exciton-biexciton states form a 3-level ladder. An intense laser is used to couple the exciton and biexciton states, which is observed as a Rabi splitting (Autler-Townes) of the exciton transition. We demonstrate picosecond control of the Rabi splitting, and a scheme to measure the Rabi oscillation between the exciton and biexciton states in the time, rather than power domain. (3) The excitonic Rabi oscillations of dots, exhibit a loss of coherence with increasing power. The source of the excitation induced dephasing is the subject of intense debate. I will present compelling experimental evidence for the role played by acoustic phonons. Dr. Andrew Ramsay University of Sheffield, United Kingdom Walter Schottky Institut Zentralinstitut der Technischen Universität München für physikalische Grundlagen der Halbleiterelektronik