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HL: Fachverband Halbleiterphysik
HL 7: Single Photon Sources and Qbits
HL 7.4: Talk
Monday, March 14, 2011, 11:45–12:00, FOE Anorg
Excitation pulse width dependence of triggered single–photon emission from InP/(Al,Ga)InP quantum dots — •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
Compact and efficient single–photon sources are a key component for future applications such as quantum cryptography and quantum communication. Electrically excited semiconductor quantum dots (QDs) are a promising approach and cover a wide emission wavelength range, depending on the material system. Recently, it was demonstrated, that InP QDs, which emit in the technologically important red spectral range, show triggered single photon emission (g(2)(0)=0.24) up to 200 MHz excitation rate [1]. However, the nonzero g(2)(0)–value could not fully be assigned due to background emission.
Here we demonstrate the influence of the finite excitation pulse width on the second–order correlation function and thereby the quality of the single–photon emission. We propose that a second exciton is captured if recombination occurs prior the end of the excitation pulse and thus leading to emission of a second photon. This mechanism is compared to a theoretical model and a good agreement is found.
[1] M. Reischle et al., APL 97, 143513 (2010)