Regensburg 2010 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 31: Poster I: Devices, Quantum Dots and Quantum Wires
HL 31.42: Poster
Dienstag, 23. März 2010, 18:30–20:30, Poster D1
Optical spectroscopy on single charge tunable InGaAs/GaAs quantum dots — •Jan Kettler1, Claus Hermannstädter1, Petr Siyushev2, Fedor Jelezko2, Jörg Wrachtrup2, Lijuan Wang3, Armando Rastelli3, Oliver G. Schmidt3, and Peter Michler1 — 1Institut für Halbleiteroptik und Funktionelle Grenzflächen, Allmandring 3, 70569 Stuttgart, Germany — 23. Physikalisches Institut, Pfaffenwaldring 57, 70569 Stuttgart, Germany — 3Institut für Integrative Nanowissenschaften IFW Dresden, Helmholtzstraße 20, 01069 Dresden, Germany
We investigate optical properties of self-assembled InGaAs quantum dots. Those are embedded in a n-i-Schottky diode structure, placed on top of a distributed Bragg reflector to increase the photoluminescence (PL) extraction. The application of a bias voltage allows deterministic charging of single quantum dots. Furthermore, a magnetic field, provided by a superconducting magnet in Faraday geometry, as well as a microwave field can be applied to the sample. The latter is achieved by pulling a wire over the sample surface that is covered by an insulation layer. We monitor the excitonic states and the deterministic charging of single quantum dots using micro-PL and excitation spectroscopy. Selective excitation of a negatively charged exciton with a particular spin configuration is aimed at by using a narrow-band laser tuned in to resonance with an excited state of the charged exciton.