Dresden 2011 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 85: Poster Session II
HL 85.87: Poster
Donnerstag, 17. März 2011, 18:00–21:00, P4
Optical Spectroscopy on Single Charge-Tunable InGaAs/GaAs Quantum Dots — •Jan Kettler1, Sven M. Ulrich1, Matthias Heldmaier1, Daniel Richter1, Wolfgang-Michael Schulz1, Robert Rossbach1, Michael Jetter1, Lijuan Wang2, Armando Rastelli2, Oliver G. Schmidt2, and Peter Michler1 — 1Institut für Halbleiteroptik und Funktionelle Grenzflächen, Allmandring 3, 70569 Stuttgart, Germany — 2Institut für Integrative Nanowissenschaften IFW Dresden, Helmholtzstraße 20, 01069 Dresden, Germany
We investigate the optical properties of self-assembled InGaAs/GaAs quantum dots (QDs) embedded into a n-i-Schottky diode structure which is placed on top of a distributed Bragg reflector in order to increase the photoluminescence (PL) extraction efficiency. The application of a bias voltage enables to control the charge state of the QDs. The ability to deterministically prepare a negative trion and its excited states is a preliminary requirement for future optical spin pumping experiments. Two similar sample structures are spectroscopically analyzed, one with QDs grown in molecular beam epitaxy and a second with QDs grown in metal organic vapor phase epitaxy. Micro-PL measurements in combination with photon cross-correlation measurements demonstrate the preparation of a negative trion ground state (X−). Polarization resolved micro-photoluminescence excitation spectroscopy is applied to reveal the excited negative trion states (X−*).