Regensburg 2013 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 73: Devices
HL 73.4: Vortrag
Donnerstag, 14. März 2013, 10:15–10:30, H15
A novel bottom-up approach for single photon emitters based on self-aligned quantum dots — •Jan-Hindrik Schulze, Waldemar Unrau, David Quandt, Tobias Heindel, Tim Germann, Ole Hitzemann, André Strittmatter, Stephan Reitzenstein, Udo Pohl, and Dieter Bimberg — Institut für Festkörperphysik, Technische Universität Berlin
Low-cost single or entangled photon sources are basic components of future semiconductor based quantum communication systems. We present a method for fabricating electrically driven single photon sources based on site-controlled quantum dots (QD). The QD positioning is induced by a buried stressor consisting of an oxide aperture which simultaneously self-aligns the current path in the pin-diode structure to the QD site. Due to the long range impact of the buried stressor this approach allows to embed QDs in defect-free matrix material leading to excellent optical properties comparable to Stranski-Krastanow QDs grown on planar surfaces. Moreover, the entire process relies only on conventional photolithographic processes compatible to mass production. Devices exhibit electroluminescence spectra of single QDs featuring linewidths of excitonic recombinations down to 25 µeV (resolution limited). The fine-structure splitting of the excitonic ground state could be measured to be (84 ± 2) µeV. Also electrically driven anti-bunching measurements confirm single photon emission with g2(0) = 0.05.