Berlin 2015 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 95: Poster IV B (Quantum dots and wires: Prepration, characterization, optical properties, and transport)

HL 95.20: Poster

Donnerstag, 19. März 2015, 14:00–20:00, Poster B

Single-photon emission from a partly stimulated two-photon emission in semiconductor quantum dots — •Dominik Breddermann, Dirk Heinze, Artur Zrenner, and Stefan Schumacher — Physics Department and Center for Optoelectronics and Photonics Paderborn (CeOPP), University of Paderborn, Warburger Strasse 100, 33098 Paderborn, Germany

In the context of designing efficient single-photon sources, semiconductor quantum dots are widely studied. Besides the established cascaded biexciton-exciton emission - underlying most of the recent studies -, also a direct two-photon transition from the biexciton to the ground state is optically allowed. We show that this higher-order transition is a promising alternative starting point to realize a single-photon source. In our scheme, an external laser field excites the system into a virtual intermediate state located in the band gap. As the quantum dot relaxes to its electronic ground state via this virtual state, a single photon is spontaneously emitted (here into a cavity mode). The properties of the single photon can be controlled all-optically by the classical laser field enabling the emission. In this contribution we introduce the scheme and focus on the calculation of photon correlation functions and investigate the spectral properties of the single photon emission.