Dresden 2011 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 34: Joint Session: Solid State Photon Sources

HL 34.7: Talk

Tuesday, March 15, 2011, 12:15–12:30, HSZ 02

A spintronic circularly-polarized single-photon source — •Andreas Merz, Pablo Asshoff, Robin Schwerdt, Heinz Kalt, and Michael Hetterich — Karlsruhe Institute of Technology (KIT)

Diluted magnetic semiconductors (DMS) are among the most promising materials for efficient spin-injection into semiconductors. They are thus ideal materials for designing a spin-polarized single photon source pumped by an electrical current. As a model system we investigate a spin light-emitting diode with the DMS ZnMnSe and an InGaAs quantum dot as single photon source. With an applied magnetic field of 2 T, a pronounced spin-polarization of ∼ 65 % is achieved, while at B = 6 T it even approaches 95 %. Autocorrelation measurements in pulsed operation mode prove the light emitted being non-classical.