Regensburg 2010 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 13: Quantum Dots and Wires: Preparation and Characterization I

HL 13.10: Vortrag

Montag, 22. März 2010, 16:30–16:45, H17

Single photon emission from positioned GaAs/AlGaAs axial heterostructure nanowires grown on pre-patterned substrate — •Jan Heinrich, Alexander Huggenberger, Tobias Heindel, Stephan Reitzenstein, Sven Höfling, Lukas Worschech, and Alfred Forchel — Technische Physik, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany

Nanowires (NWs) with axial heterostructure quantum dots (QDs) are predicted to be very efficient single photon sources (SPSs). In literature, besides the growth of positioned NW on pre-patterned substrates, also single photon emission from NW with embedded QD has been demonstrated. Here, the as-grown NWs are usually removed from the growth substrate for measurements, which has the drawback of a possible damage of the NW during the transfer. Moreover, there is an arbitrary orientation of the NW after the transfer. In contrast, we have grown AlGaAs NW with an embedded axial heterostructure GaAs QD, which allows us to probe single free standing and precisely positioned NW directly on the growth substrate. Single NW were examined by µPL and showed narrow PL emission around 740 nm with linewidths as small as 95 µeV. Morover, photon autocorrelation measurements were performed to examine the potential of the positioned NW to act as an SPS. The positioned NW with embedded QD showed clear photon anti-bunching, proving the non-classical light emission by emitting only one photon at a particular time.