Regensburg 2013 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 73: Devices
HL 73.5: Vortrag
Donnerstag, 14. März 2013, 10:30–10:45, H15
Cathodoluminescence spectroscopy and electron-beam induced current mapping of quantum devices — •Manuel Gschrey, Tuan Minh Do, Sven Rodt, Waldemar Unrau, David Quandt, Jan-Hindrik Schulze, Tim Germann, André Strittmatter, Dieter Bimberg, and Stephan Reitzenstein — Insititut für Festkörperphysik, Technische Universität Berlin
Electrically-driven single-photon sources (SPSs) are key components for future quantum communication systems. For the further development of cavity-enhanced quantum-dot (QD) based SPSs, the spatial and spectral control of the QDs, as well as the design of the current path through the device, are of utmost importance. We report on high-resolution cathodoluminescence (CL) spectroscopy and electron-beam induced current (EBIC) mapping of novel electrically driven SPSs. The SPSs are fabricated by an self-alignment process where an oxide aperture defines not only the current path through the device, but also initiates the site-controlled growth of single QDs aligned to the aperture, which provide true single photon emission with g(2)(0) = 0.05. The combination of CL spectroscopy and EBIC mapping under variation of the applied bias voltage allows us to prove the small size and high quality of the oxide aperture, as well as the spatial position of the emission lines of single QDs within the active layer of the device.