Berlin 2012 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 104: Quantum Dots and Wires: Optical Properties V (mainly Indiviual Photons)
HL 104.3: Vortrag
Freitag, 30. März 2012, 12:15–12:30, EW 201
Influence of the excitation pulse width on the purity of single-photon emission from light emitting diodes — •Fabian Hargart1, Christian Kessler1, Matthias Reischle1, Wolfgang-Michael Schulz1, Marcus Eichfelder1, Robert Roßbach1, Michael Jetter1, Paul Gartner2, Matthias Florian2, Christopher Gies2, Frank Jahnke2, and Peter Michler1 — 1Institut für Halbleiteroptik und Funktionelle Grenzflächen, Universität Stuttgart, Allmandring 3, 70569 Stuttgart — 2Institut für Theoretische Physik, Universität Bremen, Postfach 330 440, 28334 Bremen
For many applications in quantum computing and quantum cryptography single-photons on demand are desirable. Electrically driven semiconductor quantum dots are a promising solution due to their tailorable emission energy and the possible integration in well-known semiconductor devices.
Present-day pulse generators feature pulse widths only down to several 10 ps which is comparatively long to ordinary laser pulses. Therefore we determine the influence of the electrical excitation pulses on the purity of single-photon emission from InP/GaInP quantum dots. For rising widths we observe an increasing g(2)(0) - value and on account of this we assume an increasing probability of further excitations during one single cycle. Using autocorrelation measurements with high temporal resolution we can distinguish the background contribution from re-excitation processes on the non-vanishing g(2)(0)-value. Theoretical investigations are in a good agreement with the experimental results.